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20 Million Observations

On Feburary 19, 2011 the number of observations in the AAVSO International Database surpassed the 20 million mark. It is fitting that this milestone was achieved during our 100th anniversary. Below is some information about the achievement.

20-MILLION MILESTONE FOR 100-YEAR CITIZEN SCIENCE PROJECT

A citizen science project running for over 100 years reached a key milestone this month when an amateur astronomer contributed the 20 millionth observation of a variable star on February 19, 2011.

Harvard Designation

The Harvard Designation of Variable Stars

Margaret W. Mayall
This appeared in Vol. 5, No. 1 of the Journal of the AAVSO

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