Questions tagged [skyfield]
The skyfield tag has no usage guidance.
14
questions
4
votes
2
answers
195
views
Discrepancy between my results of Great Conjunction 2020 and Wikipedia
Using python-skyfield to calculate the upcoming conjunction of Jupiter and Saturn. I'm off a few minutes with the times on Wikipedia.
Wikipedia Great conjunction times (1800 to 2100)
Using Right ...
3
votes
1
answer
118
views
How to find the local azimuth of the highest point of the ecliptic
I would like to use pyephem or skyfield1 to find the degree of the local horizon (starting from South = 0°) at which is located the highest point of the ecliptic.
Note that I am not trying to find the ...
3
votes
1
answer
76
views
Skyfield missing some rise and set dates
To compute the Andromeda Galaxy Risings and Settings I essentially use this code (in a more colplex code, but this serves the purpose):
...
- 45
2
votes
3
answers
642
views
Calculating the position of stars at a given point in time
Is there any particular methods that help us calculate the position of a star at a certain point in time? This question is what I am trying to achieve, but for me, I do not want to use the data ...
2
votes
1
answer
216
views
How to calculate the Earth's axial tilt (obliquity)
How can I calculate the Earth's axial tilt in degrees. I tried Skyfield, Poliastro and PyEphem. I know it's changing -0.47"/year, and it was ...
- 155
2
votes
1
answer
230
views
How can I calculate the right ascension of an observer on Earth's surface in the TEME frame with python.skyfield?
I would like to calculate the right ascension of a point on earth as specified above with the Skyfield Python library, and I can not figure out how to do this.
I know that calculating the geocentric ...
- 43
2
votes
1
answer
85
views
2
votes
1
answer
52
views
predicting angular seperation between planetary objects and earth satellites
I am struggling to calculate the angular separation between a satellite in earth orbit and a planetary object using the Skyfield library. It's equivalent to calculating the angular separation between ...
- 21
2
votes
0
answers
141
views
Make a guide map to comet comet Leonard C/2021 A1 using Skyfield
Sky and Telescope's How Bright will Comet Leonard Get? includes the skymap and projected (possible) light curve for comet Leonard C/2021 A1 that will potentially reach +4 magnitude this month. It has ...
- 32.4k
1
vote
1
answer
151
views
RA expressed in degrees
Using the Python package Skyfield I thought that I could get the RA expressed in degrees simply by doing ra.degrees, but I get the following message
this angle is usually expressed in hours, not ...
1
vote
1
answer
121
views
Can I calculate the apparent position of comet NEOWISE C/2020 F3 from a topographic position with Skyfield?
I'd like to get .altaz(next_several_weeks) of this comet from Skyfield and .separation_from() other planets.
It reads the JPL ...
- 32.4k
1
vote
0
answers
37
views
How to get high-quality sky image for specific location & date
I'm working on an ink drawing album cover inspired by this Frank Hurley photo from the First World War, and want to put an accurate starry sky behind it in my album artwork.:
The tower in the image ...
- 375
1
vote
1
answer
71
views
How to compute rising / setting times for stars and deep sky objects with Skyfield?
I'm trying to compute rising and settings times for various objects with the Skyfield library. While the task is quite easy and well documented for planets (using the ...
- 45
0
votes
1
answer
46
views
python skyfield hipparcos sun mean longitude (L)
I calculate the ra and decl or the stars as below.
Can I add the sun's mean longitude L (=M+w) to:
...
- 33