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3 votes
1 answer
99 views

Easy guideline for using JPL Horizons DE431 for planets in aphelion and perihelion from 11000 BC to 16000 AD?

Can someone give me a step by step Guide how to use JPL DE431 or DE441 as a Beginner. I tried the Horizons website app and Webgeocalc but it didn't showed understandable Information. This websites ...
Patrick Wackenhut's user avatar
2 votes
1 answer
64 views

Inconsistency between Horizons data retrieved via Astroquery and Horizons web interface

I am attempting to obtain the x, y, z coordinates of the Sun-asteroid vector using Horizons. The code I wrote is: ...
Milagros Colazo's user avatar
5 votes
2 answers
633 views

How to calculate the true distance of the sun and the earth using skyfield?

I'm trying to calculate the true distance between the sun and the Earth using skyfield. To estimate the distance at a time instance I use the barycentric coordinates of the sun and earth using the ...
Klaus Rohe's user avatar