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Update nightshade.py to allow user-defined sub-solar coordinates #2375

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Update nightshade.py to allow user-defined sub-solar coordinates #2375

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b1e5dfe
Update nightshade.py to allow user-defined sub-solar coordinates
dsheward-astro Apr 25, 2024
bee4c45
Replaced sub_solar_coords with sub_solar_point, added description to …
dsheward-astro Apr 26, 2024
44fca8a
Docstring updated to generic body, whitespace cleanup
dsheward-astro Apr 29, 2024
b62996e
Removed trailing whitespace
dsheward-astro Apr 29, 2024
8a21be3
Removed whitespace
dsheward-astro Apr 29, 2024
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15 changes: 12 additions & 3 deletions lib/cartopy/feature/nightshade.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,9 +14,9 @@

class Nightshade(ShapelyFeature):
def __init__(self, date=None, delta=0.1, refraction=-0.83,
color="k", alpha=0.5, **kwargs):
color="k", alpha=0.5, sub_solar_point=None, **kwargs):
"""
Shade the darkside of the Earth, accounting for refraction.
Shade the darkside of a body, accounting for refraction.

Parameters
----------
Expand All @@ -29,6 +29,10 @@ def __init__(self, date=None, delta=0.1, refraction=-0.83,
refraction : float
The adjustment in degrees due to refraction,
thickness of the solar disc, elevation etc...
sub_solar_point : tuple of latitude, longitude, optional
The coordinates in degrees of the point at which the sun is directly
overhead. If both sub_solar_point and date are provided, sub_solar_point
takes precedence.

Note
----
Expand All @@ -47,7 +51,12 @@ def __init__(self, date=None, delta=0.1, refraction=-0.83,

# Returns the Greenwich hour angle,
# need longitude (opposite direction)
lat, lon = _solar_position(date)
if sub_solar_point is None:
#If not specified proceed as usual
lat, lon = _solar_position(date)
else:
#If specified, use given coordinates
lat, lon = sub_solar_point
pole_lon = lon
if lat > 0:
pole_lat = -90 + lat
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