AAVSO

AAVSO, the American Association of Variable Star Observers, is a global organization that connects professional and amateur astronomers dedicated to monitoring and studying variable stars—stars whose brightness changes over time. Members observe these stars, record their brightness, and share data to help scientists understand stellar behavior, evolution, and underlying physical processes. By pooling observations from around the world, AAVSO provides valuable, long-term data that advances astronomical research and fosters a community passionate about exploring the dynamic universe.