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Is there ECEF to ECI conversion in Skyfield?
Now I use astropy, however it works too long:
```
# Conversion to J2000
now = Time(date)
itrs = coord.ITRS(p[0]*u.km, p[1]*u.k…
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I ran into weird behaviours that won't be changed see here: https://github.com/brandon-rhodes/pyephem/issues/102
this affects twilight times.
This package, by the same author seems to be bit more …
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I created a time object and tested its length like this:
```
len(ts.utc(2018, 3, 23))
```
Because `time.tt` is a `float64` object, `self.shape` is `()`. Then when `len()` calls `self.shape[0]`…
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http://rhodesmill.org/skyfield/
When running the 2nd example to compute the apparent position of Mars when viewed from Boston at time t, skyfield gripes about "plussing" the earth body and the Topo…
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I'm propagating the orbit for 2 days time interval.
Is there a way to get the intermediate points of propagation with 1 second periodicity?
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I'm new to pyephem.
I searched the docs, and it appears it's not possible, at least for now.
would it be possible to move the observer to another planet?
I'm interested right now mostly in calculati…
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When I try to create a vector from the sun to the earth like this:
```
earth = ephem['earth']
sun = ephem['sun']
vector = earth - sun
```
I get this error:
```
AttributeError: 'ChebyshevPositi…
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Attempting to generate a 3D plot for an orbit using OrbitPlotter3D. I'm running Python ver. 3.6.5 from the Anaconda Distribution on a Mac Pro (desktop, Late 2012) under Mac OS X ver. 10.12.6 (Sierra).…
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The simplest possible example would be to propagate a satellite forward *to the midpoint in time* between a selected TLE's epoch and the epoch of the spacecraft's next TLE.
The following script app…
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``` python
# TLE for ISS
t1 = '1 25544U 98067A 12035.27140256 .00008132 00000-0 10934-3 0 9453'
t2 = '2 25544 051.6417 073.7902 0020652 004.6179 085.0245 15.58669131757138'
tle = twoline2rv(t1, …