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Results tagged with skyfield
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user 2752
4
votes
Accepted
What is the difference between GCRS and J2000 frames?
Second question first:
About the difference between GCRS and ITRS: is GCRS an ECI frame, and ITRS is an ECEF frame?
Correct.
What is the difference between GCRS and J2000 frames? Which is co …
- 77.4k
1
vote
Ephemeris for lunar body-centered body-fixed coordinates?
I'm going to jump in and give an answer before Mark Adler jumps in and tells you to use Spice in lieu of some (quite possibly outdated) Development Ephemeris.
My answer: Use Spice.
Spice provides ke …
- 77.4k
9
votes
How to obtain UTC of the epoch time in a satellite TLE (two line element)?
The term "Julian day" (or date) has three very distinct meanings. To historians, it typically means a date that is expressed in the Julian calendar, as opposed to the Gregorian calendar. For example, …
- 77.4k
4
votes
Accepted
Need help getting the true ICRF coordinates of SOHO using Horizons
Change the "Table Settings". You want to select
reference plane: Earth mean equator and equinox of reference epoch
reference system: ICRF/J2000.0
- 77.4k