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Update Circular 179 link, and save it just in case

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Brandon Rhodes 2020-07-09 20:21:18 -04:00
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@ -8,7 +8,7 @@ Further reading on the concepts and technology behind Skyfield.
*USNO Circular 179*
by George H. Kaplan, October 2005
http://aa.usno.navy.mil/publications/docs/Circular_179.php
https://www.usno.navy.mil/USNO/astronomical-applications/publications/Circular_179.pdf/at_download/file
My favorite introduction to how the International Astronomical Union
responded in 1997 and 2000 to the problems with the old J2000 system