orbit - Can someone explain to me the TEME reference frame in …
Jun 3, 2021 · TEME of Epoch—In this approach, the epoch of the TEME frame is held constant. Subsequent rotation matrices must therefore account for the change in precession and nutation from …
orbital mechanics - How to convert TEME (or ITRF) to horizontal ...
Aug 28, 2023 · I have TEME coordinates from sgp4 propagation. I can convert those (in python) to ITRF given date and time of observation. How to convert coordinates from one of those two frames to …
Fixing satellite eclipse equations from textbooks that are seemingly ...
Dec 12, 2023 · I have tried implementing equations from two different textbooks in Python to find if a satellite is in eclipse, but both fail a significant percentage of the time when tested against data from …
From TEME to RA DEC - Astronomy Stack Exchange
Dec 9, 2022 · The algorithm computes the positions (X, Y, Z) in the True Equator Mean Equinox coordinate frame (TEME). From that, I would like to find the corresponding RA DEC coordinates at …
the sun - Resolving variance between Skyfield-generated sun vectors …
Dec 29, 2023 · I have two functions that get TEME and GCRS Earth-Sun position vectors using Skyfield: earth_sun_vectors.py """Utilities for getting Earth-Sun vectors in a reference frame at a UTC …
Newest 'skyfield' Questions - Astronomy Stack Exchange
May 27, 2025 · Resolving variance between Skyfield-generated sun vectors and test data when both use same ephemeris I have two functions that get TEME and GCRS Earth-Sun position vectors …
How can I calculate the right ascension of an observer on Earth's ...
Aug 21, 2020 · I know that calculating the geocentric position of the respective Topos object at a specific time results in a Geocentric object that has an attribute .radec; however I am not confident that this …
Total length of solar eclipse - how to calculate
May 13, 2025 · I would like to perform the calculation of total length of solar eclipse including the time period from the contact I to contact IV. I calculated the Sun's angular diameter as approximately …
How long will the Apollo astronaut footprints remain visible on the ...
Dec 8, 2025 · I've seen reports that the Apollo astronauts' footprints will remain untouched on the lunar surface for hundreds of years. Space.com mentions The first footprints put on the moon will probably …
Conversion between Astronomical Frames, ex. IRCF, FK5, FK4, etc…
I'm a little bit confused about reference frames, and I was wondering if someone could help clarify a few things? So let's say I have equatorial coordinates that refer to the mean equator and equi...