observing aids

AAVSO produced JD Calendars give the last four digits of the Julian Day for each day of every month for a year. The months January-June are on one page while July–December are on the second page. For the complete JD, add 2,450,000 (or 2,460,000 after February 23, 2023) to the four digit value given in the calendar for the Astronomical Day of your observation.

Click on a year in the left column to download a 2-page .pdf version of the calendar for that year. The calendar for 2024 is shown below. Click on the image below to get a bigger version. 

What do I do when I discover a new variable star?

(Jump to Reporting Possible Nova Discoveries)

Complete Manual - 2013 edition
Handbuch zur Beobachtung von veränderlichen Sternen (6.1 MB)

Predicted Dates of Maxima and Minima of 381 Long Period Variables for 2016

A Greek translation of The AAVSO DSLR Observing Manual is now available for download.

Many thanks to Mr. Stelios Kleidis for his tremendous volunteer effort in creating this excellent translation.