Frequently asked questions
Swiss Ephemeris > Printable Ephemeris
is the difference between GMT and UT?
There is no difference between GMT (Greenwich Mean Time) and UT (Universal Time), GMT is just an older name.
does Delta T = [number] mean?
Delta T indicates the difference between UT and TDT (Terrestrial Dynamic Time), which used to be called 'Ephemeris time' in the last century. While UT is not a uniform time scale (it is occasionally adjusted, due to irregularities in the Earth's rotation), TDT is a uniform time scale which is needed as an argument for mathematical theories of celestial movements.
you offer a printable sidereal ephemeris?
No, we don't. We have little interest in 'sidereal astrology' and would not know which guru's ayanamsa to choose. They have all different ones and fight a lot about it. You can create a simple sidereal ephemeris on the Swiss Ephemeris test page, if you study all the options.
- Trying to access
one of the ephemerides for new planets / asteroids, the page gets stuck.
Why is that?
This is most likely a bug in the Internet Explorer. It displays long text data tables very slowly. You may have to wait up to 3 minutes for the page to display, and it finally will.