Useful Tools and Information

• General Information:
  • Why the Astronomical League?
  • “Take your first steps …” 8 page introductory guide, (in English), (en Español)
  • Handouts and Useful Information
  • Night Sky Observing Tools (object guides and more)

• Helpful Tools to Print on your 3-D Printer:
  • Rectified Earth Globe:  ZIP File of STL Files, Information as a PDF File
  • Mirror Holder for your Homemade Magnetometer:  ZIP File of STL Files, Information as a PDF File
  • SeeStar S50 Telescope Accessories:  ZIP File of STL files, Information as a PDF File

• Getting Started with the AL’s Observing Programs (PDF File)
• What’s Up Doc, Tonight? Excel Spreadsheet (PC only) (download)
• A Free Astronomy Textbook v2024  (PDF File) – Astronomy for Mere Mortals: a complete introductory textbook, available free, updated annually.  You may print it, or if you would like a printed copy, please contact the author, Aaron Clevenson, at aaron@clevenson.org
  • Sheet of Updates for Astronomy Textbook (future)

October 2026

• Navigating the October Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Octubre PDF File
• Navigating the Mid-October Morning Sky as a PDF File
• Navegando por el Cielo Matutino de Octubre PDF File
• Moon Occults Jupiter October 6 Eastern US as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

September 2026

• Navigating the mid-September Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Septiembre PDF File
• Navigating the Sky for Galileo Observing Program Activity as a PDF File
• Navigating the Sky for September Moon-Mars-Jupiter as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

August 2026

• Navigating the mid-August Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Agosto PDF File
• Navigating the Sky for August Lunar Eclipse as a PDF File
• Navigating the Sky for Venus Crescent View as a PDF File
• Navigating the Sky for August M10 Eye Piece view as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

July 2026

• Navigating the mid-July Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Junio PDF File
• Navigating the Sky on M6 & M7 PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

June 2026

• Navigating the mid-June Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Junio PDF File
• Navigating the Sky as Venus passes Jupiter as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

May 2026

• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

April 2026

• Navigating the mid-April Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Abril as a PDF File
• April – Enchanting Scene as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

March 2026

• Navigating the mid-March Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Marzo PDF File
• Navigating the March Lunar Eclipse as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

February 2026

• Navigating the mid-February Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Febrero PDF File
• Navigating the Young moon and Mercury as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

January 2026

• Navigating the mid-January Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Enero PDF File
• Navigating the mid-January Morning Sky as a PDF File
• Navegando por el Cielo Matutino de Enero as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) PDF File
• What’ s Up Doc – Pacific Time Zone (Seaattle WA) as a PDF File

December 2025

• Navigating the mid-December Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Deciembre PDF File
• December Morning Sky PDF File
• Cielo Matutino de Diciembre PDF File
• Jupiter Retrograde Motion PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) PDF File
• What’s Up Doc – Central Time Zone (Houston TX) PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) PDF File

November 2025

• Navigating the mid-November Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Noviembre PDF File
• Finding the Double Cluster as a PDF File

October 2025

• Navigating the mid-October Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Octubre as a PDF File
• October Morning Sky as a PDF File
• El Cielo Matutino de Octubre as a PDF File
• Big Moon Rising Illusion as a PDF File

September 2025

• Navigating the mid-September Night Sky as a PDF File, JPEG File
• Navegando por el Cielo Nocturno de Septiembre PDF File, JPEG File
• September- Moon, Venus, and Regulus as a PDF File, JPEG File
• Guide to the Great Square of Pegasus as a PDF File, JPEG File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

August 2025

• Navigating the mid-August Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Agosto PDF File
• August – Moon, Venus, and Jupiter as a PDF File
• The Coathanger (CR399) as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

July 2025

• Navigating the mid-July Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Julio PDF File, or as a JPG File
• Morning Sky in July as a PDF File, or as a JPG File
• M6 and M7 as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

June 2025

• Navigating the mid-June Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Junio PDF File, or as a JPG File
• Evening Sky in June as a PDF File, or as a JPG File
• 96 Seahorse Asterism as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

May 2025

• Navigating the mid-May Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Mayo PDF File, or as a JPG File
• Mare Orientale as a PDF File, or as a JPG File
• Moon, Mars, M44 as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

April 2025

• Navigating the mid-April Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Abril as a PDF File
• Enchanting April as a PDF File
• Understanding the Light Year (ly) as a PDF File
• Entendiendo el año luz (al) as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

March 2025

• Navigating the mid-March Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Marzo as a PDF File
• March Lunar Eclipse as a PDF File
• Alpha Ursa Major as a PDF File
• Evening Earthshine as a PDF File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

February 2025

• Navigating the mid-February Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Febrero PDF File, or as a JPG File
• Venus Crescent as a PDF File, or as a JPG File
• Young Moon, Mercury, and Venus as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone (Washington DC) as a PDF File
• What’s Up Doc – Central Time Zone (Houston TX) as a PDF File
• New* – What’s Up Doc – Mountain Time Zone (Boise ID) as a PDF File
• What’ s Up Doc – Pacific Time Zone (Seattle WA) as a PDF File

January 2025

• Navigating the mid-January Night Sky as a PDF File, JPEG File
• Navegando por el Cielo Nocturno de Enero PDF File, JPEG File
• Moon Occults Mars as a PDF File, JPEG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

December 2024

• Navigating the mid-December Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Diciembre as a PDF File
• Mars and M44 as a PDF File
• Retrograde Mars as a PDF File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

November 2024

• Navigating the mid-November Night Sky as a PDF File, JPEG File
• Navegando por el Cielo Nocturno de Noviembre PDF File, JPEG File
• Venus and M8 as a PDF File, JPEG File
• Gamma Arietis as a PDF File, JPEG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

October 2024

• Navigating the mid-October Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Octubre PDF File
• Circlet B as a PDF File
• Beta Piscis Austrini as a PDF File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

September 2024

• Navigating the mid-September Night Sky as a PDF File, JPEG File
• Navegando por el Cielo Nocturno de Septiembre PDF File, JPEG File
• September- Partial Lunar Eclipse as a PDF File, JPEG File
• Eta Cassiopeiae as a PDF File, JPEG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

August 2024

• Navigating the mid-August Night Sky as a PDF File, JPEG File
• Navegando por el Cielo Nocturno de Agosto PDF File, JPEG File
• August – Mars and Jupiter as a PDF File, JPEG File
• Xi Cephei as a PDF File, JPEG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

July 2024

• Navigating the mid-July Night Sky as a PDF File
• Navegando por el Cielo Nocturno de Julio PDF File
• July – Moon and Spica as a PDF File
• Beta Scorpii as a PDF File
• False Comet as a PDF File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

June 2024

• Navigating the mid-June Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Junio PDF File, or as a JPG File
• June – Zuben & Omega SCO as a PDF File, or as a JPG File
• Beta Cygni as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

May 2024

• Navigating the mid-May Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Mayo PDF File, or as a JPG File
• May – Moon and M44 as a PDF File, or as a JPG File
• T Coronae Borealis as a PDF File, or as a JPG File
• Binoculars and Double Stars as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

April 2024

• Navigating the mid-April Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Abril PDF File, or as a JPG File
• April’s Enchanted Evening as a PDF File, or as a JPG File
• Iota Cancri as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

March 2024

• Navigating the mid-March Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Marzo PDF File, or as a JPG File
• Evening Mercury as a PDF File, or as a JPG File
• Alpha Ursa Major as a PDF File, or as a JPG File
• NGC 4435 & NGC 4438 as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

February 2024

• Navigating the mid-February Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Febrero PDF File, or as a JPG File
• Epsilon (8) Monocerotis as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

January 2024

• Navigating the mid-January Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Eneroas a PDF File, or as a JPG File
• Delta Orionis (Mintaka) as a PDF File, or as a JPG File
• January Morning Scene as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

December 2023

• Navigating the mid-December Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Diciembre as a PDF File, or as a JPG File
• Eta Tauri (Alcyone) as a PDF File, or as a JPG File
• Io, Europa, and Ganymede Eclipses as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File 
• What’s Up Doc – Central Time Zone as a PDF File 
• What’ s Up Doc – Pacific Time Zone as a PDF File 

November 2023

• Navigating the mid-November Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Noviembre as a PDF File, or as a JPG File
• Eta Persei as a PDF File, or as a JPG File
• November PM Scene and M31 as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

October 2023

• Navigating the mid-October Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Octubre as a PDF File, or as a JPG File
• Gamma Andromedae as a PDF File, or as a JPG File
• The Moon, Venus and Regulus as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

September 2023

• Navigating the mid-September Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Septiembre as a PDF File, or as a JPG File
• Delta Cephei as a PDF File, or as a JPG File
• The Moon and Venus as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’ s Up Doc – Pacific Time Zone as a PDF File

August 2023

• Navigating the mid-August Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Agosto as a PDF File, or as a JPG File
• Beta Capricorni as a PDF File, or as a JPG File
• The Moon and Antares as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’s Up Doc – Pacific Time Zone as a PDF File

July 2023

• Navigating the mid-July Night Sky as a PDF File, or as a JPG File
• Navegando por el Cielo Nocturno de Julio as a PDF File, or as a JPG File
• Delta Serpentis  as a PDF File, or as a JPG File
• Venus, Mars, Mercury, and the Moon as a PDF File, or as a JPG File
• What’s Up Doc – Eastern Time Zone as a PDF File
• What’s Up Doc – Central Time Zone as a PDF File
• What’s Up Doc – Pacific Time Zone as a PDF File