Introduction

iPhemeris uses the Swiss Ephemeris which is based on the Jet Propulsion Laboratories (JPL) DE431 ephemerides and the US Naval Observatory equivalent for Asteroids. It offers sub-second accuracy to with .001 seconds of arc.

If you’ve purchased the Extended Ephemeris (via In-App purchase) coverage is 7700 years (4700 BC to 2995 AD) otherwise coverage is 1700 to 2100. The data range applies to all iPhemeris features.

iPhemeris uses New StyleGregorian Calendar dates starting October 15, 1582 and Julian dates or Old Style prior. However, be aware that various locales adopted the Gregorian calendar at other times; for example, Great Britain didn’t switch until September 1752. Therefore, adjust your dates accordingly.

When using the Extended Ephemeris, enter new style dates after Oct. 15, 1582 and old style dates prior. Currently iPhemeris does not support proleptic Gregorian dates for dates prior to 1582.

Note:
We use translation services, but Astrology is a special discipline and many astrological terms have dual meanings. If you notice anything out of context or incorrect in your language please notify support.