Podcasts
The Observers Notebook-Halley's Comet
Published: Nov. 1, 2023, 1 p.m.Duration: 34 minutes 48 seconds
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The Observers Notebook- Observing Saturn 2023
Published: Oct. 15, 2023, 1 p.m.Duration: 18 minutes 9 seconds
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The Observer Notebook- The October 2023 Annular Eclipse
Published: Sept. 15, 2023, 1 p.m.Duration: 29 minutes 41 seconds
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The Observers Notebook- Member profile- Trevor Barry
Published: Sept. 1, 2023, 1 p.m.Duration: 1 hour 15 minutes 57 seconds
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The Observers Notebook- The 2024 Total Solar Eclipse from Rochester NY
Published: Aug. 15, 2023, 12:59 p.m.Duration: 35 minutes 39 seconds
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The Observers Notebook- Lowell Observatory with Kevin Schlinder
Published: Aug. 1, 2023, 1 p.m.Duration: 42 minutes 29 seconds
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The Observers Notebook- Mc Donald Observatory with Katie Kizziar, and Steven Janowiecki.
Published: July 15, 2023, 1 p.m.Duration: 32 minutes
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The Observers Notebook- Summertime Meteor Showers
Published: July 1, 2023, 1 p.m.Duration: 23 minutes 52 seconds
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The Observers Notebook- The 2023 ALPO Conference
Published: June 15, 2023, 1 p.m.Duration: 30 minutes 20 seconds
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The Observers Notebook- Lick Observatory with Paul Lynam
Published: June 1, 2023, 1 p.m.Duration: 57 minutes 38 seconds
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The Observers Notebook- The Vatican Observatory with FR Paul Gabor
Published: May 15, 2023, 1 p.m.Duration: 51 minutes 50 seconds
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The Observers Notebook- Mauna Kea Observatory with Doug Simons
Published: May 1, 2023, 1 p.m.Duration: 48 minutes 56 seconds
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The Observers Notebook- The Lyrids Meteor Shower with Bob Lunsford
Published: April 15, 2023, 1 p.m.Duration: 23 minutes 31 seconds
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The Observers Notebook- A Walter Haas lecture from 2008
Published: April 9, 2023, 1 p.m.Duration: 46 minutes 27 seconds
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The Observers Notebook- Solar Observing with Kim Hay and Rik Hill
Published: April 1, 2023, 1 p.m.Duration: 24 minutes 21 seconds
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The Observers Notebook- Griffith Observatory with Dr. Edwin Krupp
Published: March 15, 2023, 1 p.m.Duration: 50 minutes 32 seconds
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The Observers Notebook- Astronomy past, present and future with Carl Hergenrother
Published: March 1, 2023, 2 p.m.Duration: 47 minutes 26 seconds
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The Observers Notebook- The Strolling Astronomer with Ken Poshedly
Published: Feb. 15, 2023, 2 p.m.Duration: 35 minutes 3 seconds
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The Observers Notebook- Don Machholz Revisited
Published: Feb. 1, 2023, 2 p.m.Duration: 42 minutes 15 seconds
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The Observers Notebook- Comets of 2023
Published: Jan. 1, 2023, 1 p.m.Duration: 45 minutes 19 seconds
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The Observers Notebook- Geminids Meteor Shower 2022
Published: Dec. 1, 2022, 1 p.m.Duration: 25 minutes 15 seconds
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The Observers Notebook- Amateur Astronomy Magazine
Published: Nov. 17, 2022, 11 p.m.Duration: 39 minutes 38 seconds
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The Observers Notebook- Mars 2022
Published: Nov. 1, 2022, noonDuration: 46 minutes 52 seconds
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The Observers Notebook- Orionids Meteor Shower 2022
Published: Oct. 15, 2022, noonDuration: 34 minutes 29 seconds
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The Observers Notebook- Upcoming 2022 eclipses
Published: Oct. 1, 2022, noonDuration: 40 minutes 27 seconds
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The Observers Notebook- Member Profile Clyde Foster
Published: Sept. 15, 2022, noonDuration: 47 minutes 21 seconds
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The Observers Notebook - Jupiter 2022
Published: Sept. 1, 2022, noonDuration: 34 minutes 12 seconds
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The Observers Notebook- Observing Venus and Saturn 2022
Published: Aug. 15, 2022, noonDuration: 30 minutes 33 seconds
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The Observers Notebook- Summertime 2022 Meteor Showers
Published: Aug. 1, 2022, noonDuration: 37 minutes 1 second
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The Observers Notebook- The ALPO at 75 with Bob Garfinkle
Published: July 15, 2022, noonDuration: 1 hour 8 minutes 19 seconds
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The Observers Notebook- The ALPO at 75 with Carlos Hernandez
Published: July 1, 2022, noonDuration: 41 minutes 26 seconds
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The Observers Notebook- The 2022 ALPO Virtual Conference
Published: June 15, 2022, noonDuration: 30 minutes 26 seconds
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The Observers Notebook- 75 Years of the Strolling Astronomer
Published: June 1, 2022, noonDuration: 1 hour 20 minutes 26 seconds
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The Observers Notebook-Radio Astronomy with the 20m Telescope
Published: May 15, 2022, noonDuration: 25 minutes 1 second
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The Observers Notebook- The May 15/16 2022 Total Lunar Eclipse
Published: May 1, 2022, noonDuration: 39 minutes 17 seconds
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The Observers Notebook- The 2022 Lyrids and more
Published: April 15, 2022, 2:46 p.m.Duration: 38 minutes 52 seconds
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The Observers Noteboook- The ALPO at 75 with Dr P Clay Sherrod
Published: April 1, 2022, noonDuration: 57 minutes 25 seconds
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The Observers Notebook- Radio Astronomy with Steve Tzikas
Published: March 15, 2022, noonDuration: 22 minutes 12 seconds
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The Observers Notebook- The ALPO at 75 with Tom Dobbins
Published: March 1, 2022, 1 p.m.Duration: 1 hour 8 minutes 55 seconds
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The Observers Notebook- Teaching Astronomy to the Visually Impaired
Published: Feb. 15, 2022, 1 p.m.Duration: 40 minutes 46 seconds
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The Observers Notebook- The American Astronomical Society
Published: Feb. 1, 2022, 1 p.m.Duration: 31 minutes 29 seconds
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The Observers Notebook- Planetary Astronomy with Christophe Pellier
Published: Jan. 15, 2022, 1 p.m.Duration: 30 minutes 33 seconds
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The Observers Notebook- Comets of 2022
Published: Jan. 1, 2022, 1 p.m.Duration: 36 minutes 26 seconds
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The Observers Notebook- Buying your first telescope
Published: Dec. 15, 2021, 1 p.m.Duration: 1 hour 13 minutes 14 seconds
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The Observers Notebook- Geminids Meteor Shower 2021
Published: Dec. 5, 2021, 1 p.m.Duration: 31 minutes 20 seconds
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The Observers Notebook- 110 Years of the AAVSO
Published: Dec. 1, 2021, 1 p.m.Duration: 39 minutes 9 seconds
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The Observers Notebook- The 2022 Winter Star Party
Published: Nov. 15, 2021, 1 p.m.Duration: 30 minutes 34 seconds
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The Observers Notebook- The November 19, 2021 Partial Lunar Eclipse
Published: Nov. 1, 2021, noonDuration: 29 minutes 16 seconds
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The Observers Notebook- Observing Uranus
Published: Oct. 20, 2021, noonDuration: 27 minutes 48 seconds
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The Observers Notebook- Mercury 2021
Published: Oct. 13, 2021, 3:45 p.m.Duration: 31 minutes 5 seconds
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The Observers Notebook-Amateur studies of Lunar Wrinkle Ridges
Published: Sept. 20, 2021, 6:06 p.m.Duration: 28 minutes 29 seconds
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The Observers Notebook- The Orion Aquisition of Meade Instruments
Published: Sept. 1, 2021, 8:49 p.m.Duration: 41 minutes 25 seconds
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The Observers Notebook- Jupiter 2021
Published: Aug. 15, 2021, noonDuration: 30 minutes 29 seconds
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The Observers Notebook- Saturn 2021
Published: Aug. 1, 2021, noonDuration: 19 minutes 5 seconds
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The Observers Notebook- The 2021 Perseids Meteor Shower
Published: July 15, 2021, noonDuration: 31 minutes 48 seconds
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The Observers Notebook- The 2021 ALPO Virtual Conference Preview
Published: June 3, 2021, 8:27 p.m.Duration: 32 minutes 31 seconds
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The Observers Notebook- International SUNday 2021
Published: June 1, 2021, noonDuration: 30 minutes 46 seconds
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The Observers Notebook- Lunar and Solar Eclipses this month!!
Published: May 15, 2021, noonDuration: 31 minutes 27 seconds
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The Observers Notebook-The James Webb Space Telescope
Published: May 1, 2021, noonDuration: 1 hour 39 seconds
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The Observers Notebook Podcast- The Lyrids Meteor Shower
Published: April 15, 2021, noonDuration: 32 minutes 48 seconds
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The Observers Notebook- The ALPO Youth Program
Published: March 1, 2021, 1 p.m.Duration: 59 minutes 55 seconds
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The Observers Notebook- Lunar Observer Alberto Anunziato
Published: Feb. 15, 2021, 1 p.m.Duration: 1 hour 5 minutes 9 seconds
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The Observers Notebook- Here Comes the Sun 2021
Published: Feb. 1, 2021, 1 p.m.Duration: 46 minutes 42 seconds
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The Observers Network- Here Comes the Sun 2021
Published: Feb. 1, 2021, 1 p.m.Duration: 46 minutes 42 seconds
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The Observers Notebook- Color Filters for Lunar and Planetary Observing
Published: Jan. 15, 2021, 12:59 p.m.Duration: 48 minutes 27 seconds
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The Observers Notebook- Comets of 2021
Published: Jan. 1, 2021, 1 p.m.Duration: 42 minutes 33 seconds
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The Observers Notebook- The New Exoplanets Section of the ALPO
Published: Dec. 15, 2020, 1 p.m.Duration: 1 hour 2 minutes 34 seconds
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The Observers Notebook- The Geminids Meteor Shower 2020
Published: Dec. 3, 2020, 1 p.m.Duration: 33 minutes 52 seconds
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The Observers Notebook- Comets with Carl
Published: Nov. 20, 2020, 7:15 p.m.Duration: 24 minutes 2 seconds
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The Observers Notebook- Carl Hergenrother LIVE from the 2020 ALPO Conference
Published: Nov. 1, 2020, 1 p.m.Duration: 39 minutes 25 seconds
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The Observers Notebook- The Orionids Meteor Shower 2020
Published: Oct. 15, 2020, noonDuration: 20 minutes 36 seconds
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The Observers Notebook- Mars 2020
Published: Oct. 1, 2020, noonDuration: 39 minutes 30 seconds
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The Observers Notebook- The 2020 ALPO Virtual Conference
Published: Sept. 10, 2020, noonDuration: 34 minutes 38 seconds
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The Observers Notebook- Venus 2020
Published: Sept. 1, 2020, noonDuration: 23 minutes
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The Observers Notebook- A Conversation with David Levy
Published: Aug. 15, 2020, noonDuration: 44 minutes 57 seconds
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The Observers Notebook- Meteor Showers with Bob Lunsford
Published: July 28, 2020, noonDuration: 26 minutes 37 seconds
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The Observers Notebook- Observing Exoplanets with Jerry Hubbell
Published: July 15, 2020, noonDuration: 57 minutes 53 seconds
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The Observers Notebook- Saturn 2020 and Comet NEOWISE
Published: July 1, 2020, noonDuration: 43 minutes 33 seconds
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The Observers Notebook- Planning Observing Sessions with John ONeal
Published: June 15, 2020, noonDuration: 48 minutes 13 seconds
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The Observers Notebook- Greg Bragg from Celestron
Published: June 1, 2020, noonDuration: 58 minutes 3 seconds
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The Observers Notebook- Solar Observer Theo Ramakers
Published: May 15, 2020, noonDuration: 43 minutes 6 seconds
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The Observers Notebook- Comet 2019 Y4 Atlas..... and more
Published: May 1, 2020, noonDuration: 1 hour 1 minute 32 seconds
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The Observers Notebook- Lyrids Meteor Shower 2020
Published: April 12, 2020, midnightDuration: 22 minutes 27 seconds
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The Observers Notebook- ALPO Round Table March 2020
Published: April 1, 2020, noonDuration: 35 minutes 2 seconds
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The Observers Notebook- Telescope Making with Zane Landers
Published: March 15, 2020, noonDuration: 1 hour 16 minutes 5 seconds
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The Observers Notebook- Messier Marathon with Don Machholz
Published: March 1, 2020, 1 p.m.Duration: 25 minutes 32 seconds
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The Observers Notebook- Betelgeuse with Bob King
Published: Feb. 1, 2020, 1 p.m.Duration: 46 minutes 18 seconds
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The Observers Notebook- The Future of CCD and CMOS imaging
Published: Feb. 1, 2020, 1 p.m.Duration: 50 minutes 44 seconds
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The Observers Notebook- The ALPO Solar Section
Published: Jan. 15, 2020, 1 p.m.Duration: 23 minutes 55 seconds
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The Observers Notebook- Quadrantids Meteor Shower
Published: Dec. 30, 2019, 1 p.m.Duration: 20 minutes 57 seconds
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The Observers Notebook- The Comets of 2020
Published: Dec. 25, 2019, 1 p.m.Duration: 36 minutes 18 seconds
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The Observers Notebook- The Geminids Meteor Shower
Published: Dec. 10, 2019, 1 p.m.Duration: 16 minutes 25 seconds
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The Observers Notebook- Member Profile Rik Hill
Published: Dec. 1, 2019, 1 p.m.Duration: 56 minutes 44 seconds
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The Observers Notebook- The Jupiter Section with Craig Mac Dougal
Published: Nov. 15, 2019, 1 p.m.Duration: 51 minutes 27 seconds
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The Observers Notebook- November 11, 2019 Mercury Transit
Published: Nov. 6, 2019, 3:51 a.m.Duration: 29 minutes 27 seconds
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The Observers Notebook- The 2019 Orionids Meteor Shower
Published: Oct. 15, 2019, noonDuration: 20 minutes 55 seconds
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The Observers Notebook- Member Profile Julius Benton
Published: Oct. 1, 2019, noonDuration: 44 minutes
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The Observers Notebook- The International Dark Sky Association
Published: Sept. 15, 2019, noonDuration: 38 minutes 33 seconds
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The Observers Notebook- Dr. Erin Macdonald
Published: Sept. 1, 2019, noonDuration: 47 minutes 10 seconds
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The Observers Notebook- The HopObservatory with Grant Tandy
Published: Aug. 15, 2019, noonDuration: 30 minutes 40 seconds
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The Observers Notebook with Pranvera Hyseni
Published: Aug. 1, 2019, 11 a.m.Duration: 57 minutes 56 seconds
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The Observers Notebook- The Apollo Landing Site Observing Program
Published: July 15, 2019, noonDuration: 1 hour 2 minutes 18 seconds
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The Observers Notebook- Saturn 2019 with Julius Benton
Published: July 1, 2019, noonDuration: 26 minutes 11 seconds
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The Observers Notebook- The Moon with Chuck Wood
Published: June 15, 2019, 3:44 p.m.Duration: 51 minutes 39 seconds
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The Observers Notebook- The 2019 ALPO Conference
Published: June 1, 2019, noonDuration: 30 minutes 21 seconds
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The Observers Notebook- The July 2019 Total Solar Eclipse
Published: May 15, 2019, noonDuration: 17 minutes 49 seconds
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The Observers Notebook- The Aquariids Meteor Shower
Published: May 1, 2019, noonDuration: 23 minutes 24 seconds
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The Observers Notebook-Member Profile- Mike Reynolds
Published: April 15, 2019, noonDuration: 41 minutes 17 seconds
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The Observers Notebook- National Astronomy Day
Published: March 29, 2019, 7:46 p.m.Duration: 34 minutes 29 seconds
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The Observers Notebook- David and Valorie Whalen
Published: March 15, 2019, 11 a.m.Duration: 51 minutes 52 seconds
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The Observers Notebook- The January 20, 2019 Lunar Eclipse Meteor Strike
Published: March 1, 2019, 2 p.m.Duration: 21 minutes 43 seconds
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The Observers Notebook-Member Profile- Steve Siedentop
Published: Feb. 15, 2019, 2 p.m.Duration: 44 minutes 43 seconds
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The Observers Notebook- The Mercury Section
Published: Feb. 1, 2019, 2 p.m.Duration: 36 minutes 8 seconds
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The Observers Notebook- Comets of 2019
Published: Jan. 15, 2019, 2 p.m.Duration: 34 minutes 24 seconds
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The Observers Notebook- January 20, 2019 Total Lunar Eclipse
Published: Jan. 1, 2019, 2 p.m.Duration: 17 minutes 33 seconds
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The Observers Notebook- Quadrantid Meteor Shower 2019
Published: Dec. 29, 2018, 2 p.m.Duration: 14 minutes 28 seconds
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The Observers Notebook- Comet 2018 V1 with Don Machholz
Published: Dec. 15, 2018, 2 p.m.Duration: 43 minutes 8 seconds
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The Observers Notebook- The 2018 Geminds Meteor Shower with Bob Lunsford
Published: Dec. 1, 2018, 2 p.m.Duration: 17 minutes 39 seconds
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The Observers Notebook-The OSIRIS-REx Mission with Carl Hergenrother
Published: Nov. 15, 2018, 2 p.m.Duration: 26 minutes 10 seconds
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The Observers Notebook- Parker Solar Probe with John O Neal
Published: Nov. 1, 2018, 5:39 p.m.Duration: 35 minutes 24 seconds
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The Observers Notebook- Comet 46P Wirtanen
Published: Oct. 20, 2018, 4:30 p.m.Duration: 17 minutes 50 seconds
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The Observers Notebook with Caitlin Ahrens
Published: Oct. 1, 2018, 5:53 p.m.Duration: 26 minutes 4 seconds
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The Observers Notebook- Rachel Freed SAS/ALPO 2018
Published: Sept. 15, 2018, 1 p.m.Duration: 25 minutes 6 seconds
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The Observers Notebook- Pamela Shivak and InternationalSUNday
Published: Aug. 16, 2018, 1:30 a.m.Duration: 38 minutes 29 seconds
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The Observers Notebook- SAS/ALPO Symposium Brian Cudnik
Published: Aug. 15, 2018, 1 p.m.Duration: 25 minutes 23 seconds
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The Observers Notebook- The 2018 Perseids Meteor Shower
Published: Aug. 1, 2018, 1 p.m.Duration: 22 minutes 32 seconds
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The Observers Notebook- The July 27 2018 Total Lunar Eclipse
Published: July 15, 2018, 1 p.m.Duration: 19 minutes 35 seconds
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The Observers Notebook- An update to Mars 2018
Published: July 1, 2018, 1 p.m.Duration: 23 minutes 24 seconds
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The Observers Notebook- RTMC at 50 with Bob Stephens
Published: June 15, 2018, 1 p.m.Duration: 54 minutes 57 seconds
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The Observers Notebook- It's Comet Season!
Published: June 1, 2018, 1 p.m.Duration: 38 minutes 13 seconds
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The Observers Notebook- The Lunar Dome Section
Published: May 15, 2018, 1 p.m.Duration: 35 minutes 14 seconds
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The Observers Notebook- An interview with Astrophotographer Damian Peach
Published: May 1, 2018, 2 p.m.Duration: 25 minutes 43 seconds
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The Observers Notebook- Discovering Comets with Don Machholz
Published: April 15, 2018, 1 p.m.Duration: 43 minutes 21 seconds
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The Observers Notebook-Pro/Am collaboration in astronomy
Published: April 1, 2018, 1 p.m.Duration: 44 minutes 56 seconds
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The Observers Notebook- The 2018 Joint Conference with the SAS and the ALPO
Published: March 14, 2018, 1:21 p.m.Duration: 39 minutes 29 seconds
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The Observers Notebook- The Great 2017 Total Solar Eclipse
Published: Feb. 28, 2018, 2:47 p.m.Duration: 26 minutes 28 seconds
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The Observers Notebook- Making Light Curves of Minor Planets
Published: Feb. 15, 2018, 2:06 p.m.Duration: 30 minutes 40 seconds
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The Observers Notebook-Beginning Lunar/Planetary and Solar Astrophotography
Published: Feb. 1, 2018, 2:09 p.m.Duration: 57 minutes 36 seconds
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The Observers Notebook-The January 31, 2018 Total Lunar Eclipse
Published: Jan. 26, 2018, 7:17 p.m.Duration: 28 minutes 54 seconds
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The Observers Notebook- The ALPO 2018 and Beyond
Published: Jan. 15, 2018, 5:35 p.m.Duration: 20 minutes
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The Observers Notebook- The 2018 Mars Opposition
Published: Jan. 3, 2018, 3:07 a.m.Duration: 33 minutes 52 seconds
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The Observers Notebook- Bright Comets for 2018
Published: Dec. 15, 2017, 5:54 p.m.Duration: 39 minutes 49 seconds
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The Observers Notebook- The 2017 Geminids Meteor Shower
Published: Dec. 7, 2017, 11:06 p.m.Duration: 17 minutes 32 seconds
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The Observers Notebook- The Lunar Meteoric Impact Search Program
Published: Dec. 1, 2017, 3:50 p.m.Duration: 29 minutes 7 seconds
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The Observers Notebook- The Remote Planets Section
Published: Nov. 15, 2017, 9:19 p.m.Duration: 18 minutes 5 seconds
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The Observers Notebook- The History of Astronomy
Published: Nov. 6, 2017, 3:11 a.m.Duration: 41 minutes 9 seconds
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The Observers Notebook-The 2017 Orionids Meteor Shower
Published: Oct. 14, 2017, 1:57 a.m.Duration: 18 minutes 32 seconds
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The Observers Notebook- The Mars Section
Published: Sept. 30, 2017, 2:58 p.m.Duration: 36 minutes 34 seconds
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The Observers Notebook- Saturn Report 2017
Published: Sept. 15, 2017, 5:33 a.m.Duration: 17 minutes 27 seconds
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The Observers Notebook- The State of the Podcast
Published: Sept. 1, 2017, 10:07 p.m.Duration: 10 minutes 5 seconds
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The Observers Notebook- The Meteorite Section
Published: Aug. 31, 2017, 3:38 a.m.Duration: 32 minutes 9 seconds
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The Observers Notebook- The 2017 Total Solar Eclipse- Travel Log
Published: Aug. 24, 2017, 11:58 p.m.Duration: 33 minutes 36 seconds
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The Observers Notebook- Telescopes with Scott Roberts
Published: Aug. 13, 2017, 6:06 p.m.Duration: 51 minutes 23 seconds
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The Observers Notebook-The 2017 ALPO Convention
Published: Aug. 1, 2017, 3:25 a.m.Duration: 25 minutes 13 seconds
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The Observers Notebook-Lunar Transient Phenomena
Published: July 18, 2017, 11:13 p.m.Duration: 18 minutes 37 seconds
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The Observers Notebook- The Comets Section
Published: July 1, 2017, 2:19 p.m.Duration: 34 minutes 25 seconds
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The Observers Notebook- The Jupiter Section
Published: June 17, 2017, 3:32 p.m.Duration: 22 minutes 5 seconds
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The Observers Notebook- The Minor Planets Section
Published: June 9, 2017, 1:51 a.m.Duration: 13 minutes 12 seconds
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2017 Total Solar Eclipse- Columbia South Carolina
Published: June 6, 2017, 8:40 p.m.Duration: 20 minutes 53 seconds
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2017 Total Solar Eclipse- St Joseph Missouri
Published: June 2, 2017, 8:14 p.m.Duration: 22 minutes 22 seconds
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2017 Total Solar Eclipse-Madras Oregon
Published: June 1, 2017, 12:59 p.m.Duration: 23 minutes 43 seconds
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2017 Total Solar Eclipse- Casper Wyoming
Published: May 31, 2017, 1:30 p.m.Duration: 17 minutes 15 seconds
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2017 Total Solar Eclipse- Stapleton Nebraska
Published: May 30, 2017, 1:43 p.m.Duration: 17 minutes 22 seconds
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The Observers Notebook- The Saturn Section
Published: May 26, 2017, 11:40 p.m.Duration: 17 minutes 54 seconds
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The Observers Notebook- The History of Amateur Astronomy in the US
Published: May 18, 2017, 8:09 p.m.Duration: 1 hour 23 minutes 10 seconds
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The Observers Notebook- Lunar Topographical Studies
Published: May 11, 2017, 9:58 p.m.Duration: 25 minutes 5 seconds
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The Observers Notebook-The Meteor Section
Published: April 28, 2017, 3:33 p.m.Duration: 23 minutes 14 seconds
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The Observers Notebook- The Venus Section
Published: April 16, 2017, 4:48 a.m.Duration: 22 minutes 34 seconds
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The Observers Notebook- The Great Total Solar Eclipse of 2017
Published: April 3, 2017, 4:40 p.m.Duration: 30 minutes 41 seconds
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The Observers Notebook- The Solar Section
Published: March 26, 2017, 4:49 p.m.Duration: 12 minutes 59 seconds
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The Observers Notebook- The ALPO Training Program
Published: March 14, 2017, 3:25 a.m.Duration: 39 minutes 28 seconds
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The Observers Notebook- The Journal of the ALPO
Published: March 3, 2017, 3:36 a.m.Duration: 24 minutes 55 seconds
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The Observers Notebook -The Lunar Section
Published: Feb. 20, 2017, 4:46 p.m.Duration: 32 minutes 12 seconds
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The Observers Notebook- A history of the ALPO
Published: Feb. 3, 2017, 3:39 a.m.Duration: 20 minutes 50 seconds
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