What does AAVSO stand for?

American Association of Variable Star Observers (aka American Association of Variable Stars Observers)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.
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Samples in periodicals archive:

The researchers settled on R Scuti because of its brightness and the wealth of long-term observations compiled by Janet Mattei, director of the American Association of Variable Star Observers in Cambridge, Mass.

Heavenly chaos: a star's erratic emissions

She was an active observer, volunteer, and benefactor for the American Association of Variable Star Observers (AAVSO).

The Rohm and Haas Phoebe Waterman Haas Award Honors Women Leaders

During the mission, a network of amateur astronomers using visible-light telescopes will monitor some 275 cataclysmic variables and tell a coordinating group -- the American Association of Variable Star Observers (AAVSO) in Cambridge, Mass.

Exploring the Extreme Ultraviolet