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Explain refraction arguments to altaz() methods

This commit is contained in:
Brandon Rhodes 2020-02-04 17:26:00 -05:00
parent 2b97530afd
commit 15272f4cab
1 changed files with 25 additions and 0 deletions
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skyfield/positionlib.py
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@ -1,3 +1,4 @@
# -*- coding: utf-8 -*-
"""Classes representing different kinds of astronomical position."""
from numpy import arccos, array, clip, einsum, exp, full, nan
@ -397,6 +398,18 @@ class Geometric(ICRF):
from geographic north (so 0 degrees means north, 90 is east, 180
is south, and 270 is west).
By default, Skyfield does not adjust the altitude for
atmospheric refraction. If you want Skyfield to estimate how
high the atmosphere might lift the body's image, give the
argument ``temperature_C`` either the temperature in degrees
centigrade, or the string ``'standard'`` (in which case 10°C is
used).
When calculating refraction, Skyfield uses the observer’s
elevation above sea level to estimate the atmospheric pressure.
If you want to override that value, simply provide a number
through the ``pressure_mbar`` parameter.
"""
return _to_altaz(self.position.au, self.observer_data,
temperature_C, pressure_mbar)
@ -539,6 +552,18 @@ class Apparent(ICRF):
from geographic north (so 0 degrees means north, 90 is east, 180
is south, and 270 is west).
By default, Skyfield does not adjust the altitude for
atmospheric refraction. If you want Skyfield to estimate how
high the atmosphere might lift the body's image, give the
argument ``temperature_C`` either the temperature in degrees
centigrade, or the string ``'standard'`` (in which case 10°C is
used).
When calculating refraction, Skyfield uses the observer’s
elevation above sea level to estimate the atmospheric pressure.
If you want to override that value, simply provide a number
through the ``pressure_mbar`` parameter.
"""
return _to_altaz(self.position.au, self.observer_data,
temperature_C, pressure_mbar)