Astronomy - The Sun and Stars

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Messier Catalog
"The purpose of these web pages is to provide a complete guide to the 110 objects recognized as the standard Messier catalog."

Stars, Galaxies, and Cosmology
A general introduction for the beginning or non-science major.
Web syllabus and notes from Astronomy 162, Dept. of Physics & Astronomy, University of Tennessee

Royal Greenwich Observatory/USAF/NOAA Sunspot Record 1874-1999
"The Royal Greenwich Observatory (RGO) compiled sunspot observations from a small network of observatories to produce a dataset of daily observations starting in May of 1874. The observatory concluded this dataset in 1976 after the US Air Force (USAF) started compiling data from its own Solar Optical Observing Network (SOON). This work was continued with the help of the US National Oceanic and Atmospheric Administration (NOAA) with much of the same information being compiled through to the present... The entire dataset is available below as ASCII text files containing records for individual years. Each file consists of records with information on individual sunspot groups for each day that spots were observed."
By David H. Hathaway

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