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but you will probably soon find yourself recognizing a star ' s age by its color
ISBN 13: 9781931559133
" even for other writers in the field
About the book Astronomical Algorithms
The second edition contains new chapters about the Jewish and Moslem Calendars
Planisphere, 30 Degrees South New Releases but you will probably soonFormat: Chart The "down under" version of Sky & Telescopes planisphere is plotted for skygazers near latitude 30 degrees South, perfect for folks living in Australia or South America. This is the only planisphere we carry that shows the Southern Hemisphere's sky. ISBN 13: 9781931559133
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