Contemporary Models
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[Meeus] Astronomical Algorithms. Jean Meeus. 2nd edition. Willmann-Bell. 1998. isbn.nu/0943396611
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[Montenbruck] Astronomy on the Personal Computer. Oliver Montenbruck, Thomas Pfleger. 4th edition. Springer Verlag. 2000. isbn.nu/3540672214
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[Dershowitz] Calendrical Calculations. Nachum Dershowitz, Edward M. Reingold. 3rd edition. Cambridge University Press. 2008. isbn.nu/0521702386
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[Dermott] Solar System Dynamics. S. F. Dermott. Carl D. Murray. Cambridge University Press. 2000. isbn.nu/0521575974
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[HowTo] How to compute planetary positions. stjarnhimlen.se/comp/ppcomp.html
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[SkyView]Sky View. www.sky-view.co.il
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[INMS] Israeli New Moon Society. sites.google.com/site/moonsoc
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[EarthTools] EarthTools. www.earthtools.org/webservices.htm#usage
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[NOAA] NOAA Solar Calculator. www.esrl.noaa.gov/gmd/grad/solcalc
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[NOP] Naval Oceanography Portal. aa.usno.navy.mil/data/index.php
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[Zmanim] Zmanim. www.myzmanim.com/search.aspx; TODO also kosherjava.com/zmanim-project/how-to-use-the-zmanim-api/
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[MikvahCalendar] MikvahCalendar. www.mikvahcalendar.com