== Eksterne henvisninger ==
{{commonsbilleder|Ephemeris|Efemeride}}
* [http://ssd.jpl.nasa.gov/?horizons Efemerider online]{{Webarchive|url=https://web.archive.org/web/20070328180634/http://ssd.jpl.nasa.gov/?horizons |date=28. marts 2007 }} fra [[Jet Propulsion Laboratory]] (JPL)
* [http://ssd.jpl.nasa.gov/iau-comm4/README Introduktion til JPL efemerider ([[NASA]])] {{Webarchive|url=https://web.archive.org/web/20050226015740/http://ssd.jpl.nasa.gov/iau-comm4/README |date=26. februar 2005 }}
* [http://www.moshier.net/ Kildekode til beregning af efemerider] {{Webarchive|url=https://web.archive.org/web/20091208100839/http://www.moshier.net/ |date= 8. december 2009 }} – af Steve Moshier
* [http://astroclub.tau.ac.il/ephem/Daily/ ''Daily ephemeris''] {{Webarchive|url=https://web.archive.org/web/20070629152243/http://astroclub.tau.ac.il/ephem/Daily/ |date=29. juni 2007 }}, fra [http://astroclub.tau.ac.il/ TAU AstroClubs hjemmeside] {{Webarchive|url=https://web.archive.org/web/20110511120936/http://astroclub.tau.ac.il/ |date=11. maj 2011 }}
Filosofi