Conventions of the Astronomical League

Astronomical League conventions provide an opportunity for amateur astronomers all over the country to gather together to learn and exchange ideas, techniques, and opnions on astronomy. All of our conventions provide professional astronomers to address the attendees about their field of expertise. This allows the amateur to learn about the latest discoveries in astronomy directly from the astronomers making the discoveries.

Our national conventions, called ALCons (Astronomical League CONventionS) usually take place over a four-day period starting on Wednesday and ending in an awards banquet on Saturday. There are lectures scheduled throughout the event for those interested in astronomy from the beginner to the advanced amateur. There are often parts of the schedule that are geared specifically for the general public. Please check the various convention pages for further information.

The ALCons often include tours to astronomical facilities located near the convention site. We frequently visit local observatories, university facilities, NASA centers, and many other astronomically-related sites. ALCon attendees have visted the Jet Propulsion Laboratory (Pasadena, CA), the Meteorite Lab at Washington University (St. Louis, MO), Mt. Evans Observatory (the highest in the world, Copper Mountain, CO), Dearborn Observatory (Evanston, IL), Kitt Peak (Tucson, AZ), Yerkes Observatory (Williams Bay, WI) , Linda Hall Library (antique astronomy books, including William Herschel's journal documenting the discovery of Uranus, Kansas City, MO) and many, many more. Most of these tours were specially designed for amateur astronomers.

Observing in the evening is usually available whether you bring your own telescope or use someone else's telescope. You can observe all night if you want, but you will probably sleep through the morning papers sessions!

We also try to schedule our ALCons where there will be activities for the non-astronomers in the family. There are frequently tours scheduled to attractions for the non-astronomer. With the ALCon staring on Wednesday, there is plenty of time to visit nearby places of interest before coming to the convention, or you can just relax and enjoy the local accomodations

We hope to see you at our next ALCon! It will be fun and informative!

Upcoming Conventions

ALCon 2023 – Astronomical Gumbo

The 2023 Astronomical League Convention(ALCon 2023) will be held in Baton Rouge, Louisiana from July 26th to 29th. Our theme will be “Astronomical Gumbo,” which represents the blend of diverse subfields and people within the vast field of astronomy. Gumbo is a dish that combines the culinary practices of Africans, Native Americans, French, and Spanish, and is often used as a metaphor for the mix of cultures that exist in southern Louisiana. Baton Rouge, which is French for “red stick,” is the capital of Louisiana and sits along the mighty Mississippi River. The city’s many attractions include a planetarium, the new and old State Capitol buildings, and many museums. Serving as the melting pot between the urban cityscape and the rural scenes of nature, Baton Rouge is home to plenty of art, music, and great food for visitors and families to enjoy.

ALCon 2023 will be host by Baton Rouge Astronomical Society, or B.R.A.S., was established in 1981. With over 100 members, it is Baton Rouge’s premier meeting place for amateur astronomers. B.R.A.S. features a diverse collection of individuals, ranging from new members seeking to learn the basics to more experienced observers sharing their knowledge with others. Anyone who shares the common love of astronomy is welcome to join.

Previous Conventions


  • ALCon 1965, Milwaukee, WI
  • ALCon 1964, Denver, CO
  • ALCon 1963, Orono, ME
  • ALCon 1962, Albuquerque, NM
  • ALCon 1961, Detroit, MI
  • ALCon 1960, Haverford, PA
  • ALCon 1959, Denver, CO
  • ALCon 1958, Ithaca, NY
  • ALCon 1957, Kansas City, MO
  • ALCon 1956, Miami, FL
  • ALCon 1955, Seattle, WA
  • ALCon 1954, Madison, WI
  • ALCon 1953, Washington, DC
  • ALCon 1952, Dallas, TX
  • ALCon 1951, Chapel Hill, NC
  • ALCon 1950, Wellesley, MA
  • ALCon 1949, Cleveland, OH
  • ALCon 1948, Milwaukee, WI
  • ALCon 1947, Philadelphia, PA
  • ALCon 1946, Bloomfield Hills, MI
  • 1945 (None held due to WW II)
  • 1944 (None held due to WW II)
  • 1943 (None held due to WW II)
  • 1942 (None held due to WW II)
  • ALCon 1941, Washington, DC
  • ALCon 1940, Pittsburgh, PA
  • ALCon 1939, New York, NY