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I don't fully understand the differences of meta, location, and systemdef, in terms of how they should be used.
systemdef expects TMY meta to be used in its first parameter. But what if I want to us…
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### ephemeris
- n.
- A table giving the coordinates of a celestial body at a number of specific times during a given period.
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This issue is to track getting ephemeris calculations hooked up t…
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I wanted to check how the Sun will go with time, using the _Astronomical calculations_→_Ephemeris_ facility, but it appears that the markers are slightly off the target. For details see the screenshot…
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In comparison with the data from JPL Horizons it gives some error:
```
JPL: [-1.10659532e+08 9.70047434e+07 -2.39525979e+04]
JL: [-1.10369890e+08 8.93069592e+07 3.86931886e+07]
```
Hovewer…
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For Earth satellites in high orbits, the effects of the Moon become important and the time between published TLE epochs become longer. Satellites like Spektr-R and IBEX have 10-day orbits for example.…
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The Haurwitz model takes apparent_zenith as its argument. pvlib ephemeris calculations can return zenith>90 for times after sunset. The Haurwitz model includes this term:
`np.exp(-0.059/cos_zenith)…
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With discussions started in multiple threads at this point with issues stemming from finding suitable hardware and coding or interpreting output to utilize solid state gyros and magnetometers for the …
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A suggestion from @dkirkby:
> There is an alternative to adding the pyephem dependency that I have
> used before and you might want to consider: pre-compute a grid of
> ephemeris data covering …
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get_hour_angle seems to have the wrong sign.
For example 1.6.1 in the book "Solar Engineering of Thermal Processes by Duffie and Beckman, fourth edition, Wiley 2013" the hour angle should be -22.5. (…
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I use the date to get the sun position, but the result's longitude have a little difference from astrolog32, why?