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observing aids

Title Posted By Updated/commented date Typesort icon
The Zurich Classification System of Sunspot Groups Matthew Templeton 4 years 29 weeks ago Page
The Photoelectric Photometry (PEP) Observing Program of the AAVSO: An Introduction Anonymous 38 weeks 4 days ago Page
Useful links for new solar observers Matthew Templeton 3 years 17 weeks ago Page
Charts and Sequences Update January 2012 SXN 4 years 2 weeks ago Page
Frequency of Observations for Different Variable Star Types BSJ 5 years 36 weeks ago Page
Charts and Sequences Update September 2011 SXN 4 years 19 weeks ago Page
AAVSO Bulletin Matthew Templeton 2 years 18 weeks ago Forum topic
AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484