Get ECI coordinates from measurements

[Serrof]

Hi there

Sorry for the delayed reply.
This thread is similar to yours:

Topocentric Position to Geocentric Frame Conversion

My bad, the link I gave you @panik was for converting AzEl, which are in a topocentric frame with “geodetic” axes. As Luc pointed out, topocentric RaDec usually use inertially oriented axes. Cheers, Romain

You should be able to extract what you need. Let me know if you struggle.

Cheers,
Romain.