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I've been using skyfield to work on a program to track satellites. However, now whenever I run my program it keeps loading a file called "Leap_Second.dat". This file has the leap seconds data for time…
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ditto: http://stackoverflow.com/questions/36740731/convert-a-direction-vector-to-r-a-and-dec-in-skyfield
Within [Skyfield](http://rhodesmill.org/skyfield/), if I have a vector (x, y, z) from the cent…
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In the section http://rhodesmill.org/skyfield/time.html#uniform-time-scales-tai-tt-and-tdb
> Uniform time scales: TAI, TT, and TDB¶
> Date arithmetic becomes very simple as we leave UTC behind and co…
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As noted in #2244 and #3217, eventually we should support using the JPL ephemerides. A good place to start would be @brandon-rhodes https://github.com/brandon-rhodes/python-jplephem
It needs some mec…
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Dear all,
Does PyEphem include any kind of perturbations for orbit propagation? Atmospheric models as well?
Thanks! Ricardo.
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It would be useful at some point to have a method to calculate apparent angular separation.
I'm calculating solar eclipse visibility on the earth and on planes, and to track something like "path of …
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I'm experiencing with Python and PyEphem, while playing I wrote this simple script:
``` python
import ephem
citta = ephem.Observer()
sole = ephem.Sun()
citta.temp = 20
citta.pressure = 1013
citta.la…
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Comparing a JulianData object to anything else than another JulianDate object crashes with:
```
AttributeError: object has no attribute 'tt'
```
I would have expected to simply return False.
I did…
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How skyfield supports new DE430? Or I have to use DE421?
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I'm using sgp4 to get TEME coordinates. I could use skyfield to convert these to GCRS. My problem is that this adds a massive dependency to my own library, caused by the de421 dependency of skyfield …