Skip to main content

observing aids

Title Posted By Updated/commented date Typesort icon
New Chinese Visual Observing Manual BSJ 2 years 29 weeks ago Page
Visual Observing Manual - Chinese BSJ 2 years 30 weeks ago Page
The Zurich Classification System of Sunspot Groups Matthew Templeton 3 years 49 weeks ago Page
Visual Observing Manual in Persian BSJ 3 years 19 weeks ago Page
Visual Observing Manual - Spanish BSJ 1 year 26 weeks ago Page
AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484