poliastro.earth.util
¶
Module Contents¶
Functions¶
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RAAN angle from LTAN for SSO around the earth |
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Gets the local sideral time from input location. |
- poliastro.earth.util.raan_from_ltan(epoch, ltan=12.0)¶
RAAN angle from LTAN for SSO around the earth
- Parameters
- Returns
RAAN – Right ascension of the ascending node angle in GCRS
- Return type
Notes
Calculations of the sun mean longitude and equation of time follow “Fundamentals of Astrodynamics and Applications” Fourth edition by Vallado, David A.
- poliastro.earth.util.get_local_sidereal_time(lon, time)¶
Gets the local sideral time from input location.
- Parameters
lon (astropy.units.Quantity) – East longitude of a point on a body.
time (astropy.time.Time) – Time at which to calculate the local sidereal time.
- Returns
theta – Local Sidereal Time (LST).
- Return type