So why does the docs say:
*Note that ephemeris files never receive updates, so once you have a file 
like de421.bsp on disk you never need to download it again.*

The configured bsp-file will be downloaded and the file, according to the 
docs, never changes. 

Karen K schrieb am Montag, 1. Dezember 2025 um 11:08:18 UTC+1:

> [email protected] schrieb am Montag, 1. Dezember 2025 um 08:12:16 UTC+1:
>
> Skyfield epehmeris data files don't receive updates. If there is an 
> update, there will be new files. So you download the file once and never 
> update it, and you may use it for decades.
> https://rhodesmill.org/skyfield/planets.html
>
>
> Not true. Celestrak files are updated very often. Timescales are updated 
> as well. And even the ephemerides of the planets are updated sometimes.
>
> It depends on the configuration what the WeeWX Skyfield almanac extension 
> does. If the user set up to use Earth satellite data, they get updated 
> daily. And it is no use to do it less often. Time scales and ephemerides 
> files get downloaded as configured (where it is possible to switch off 
> updates).
>

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