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An observer object can translate local azimuth and altitude coordinates into astrometric RA/Dec by calling [`Observer.radec_of()`](https://github.com/brandon-rhodes/pyephem/blob/master/extensions/_lib…
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The code below shows the proper way to cut some variables up to 3 decimals, namely subpoint elevation, distance, but the same command ({0:.3f}) fails when applied to vectors (rho), (R), (r). May I hav…
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I feel like this is going to be my fault but here we go. I'm working on a python 2.7.x codebase and found `AttributeError: 'Topos' object has no attribute 'position'` when trying to calculate visible …
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If I'm not mistaking, the format of _deltat.preds_ provided by the USNO recently changed.
While in the old format, it looked like this:
> YEAR TT-UT PREDICTION UT1-UTC PREDICTION ERROR
>
> 2…
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I've faced the following error:
```
Python 2.7.5 (default, Jul 13 2018, 13:06:57)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux2
Type "help", "copyright", "credits" or "license" for more info…
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I am calculating Planet (Mars & Mercury) Position on 27 Feb 1983 17:34:00
Skyfield Result :
Mars 2.3836313274432888 deg
**Mercury 321.5257022360414 deg**
Swiss Ephemeris Result:
Mars …
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This may be user error, but the following code:
```
#!/usr/bin/env python3
from datetime import date, datetime, timezone, timedelta
from skyfield import api, almanac
from skyfield.api import …
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The current version uses an out-of-date version of the get_sun_position code. We want to update that to use the get_skyfield_position code along with using the NuSTAR TLE to account for parallax corre…
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I use pyephem in my Ubuntu indicator (indicator-lunar) and am trialling python-skyfield to possibly jump across in the future.
Given the ephemeris is downloaded first time by python-skyfield, or lo…
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Hi,
I'm stuck with the following. I'm doing many orbit calculations for polar earth satellites and I can't understand why, when the eccentricity falls below some value, the perigee is not where it …