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 …
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 …
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 …
Eccentricity of TLE orbit from velocity and radius in TEME
Jul 26, 2023 · The data in the TLE aren't really orbital elements, even though many fields have the same name. They are just values generated to reproduce the actual position and velocity within some …
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...
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 …
How to find Greenwich Mean Sideral Time? - Astronomy Stack Exchange
To do so, I'm following what's described in this document and implementing C++ code. That is a very old document you are using. It's using the 1982 IAU precession model. There have been multiple …
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
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 using Skyfield: ...