AAVSO's Visual Variable Star Observing Manual provides guidance on planning, conducting, and reporting visual observations of variable stars.
The manual, published by the American Association of Variable Star Observers, introduces new and experienced observers to the fundamentals of visual variable‑star observing. It explains what variable stars are, why they are scientifically important, and how the AAVSO supports observers worldwide.
The guide is organized into chapters covering preparation, equipment, observing techniques, data recording, Julian‑date calculations, program planning, and submission of observations to the AAVSO database. Appendices provide sample light curves, additional resources, and an index for quick reference. This manual is written in Chinese.
A variable star is a star whose brightness changes over time.