rad = km2rad(km)
converts distances from kilometers to radians, as measured along a great circle on a
sphere with a radius of 6371 km, the mean radius of the Earth.
rad = km2rad(km,radius)
converts distances from kilometers to radians, as measured along a great circle on a
sphere having the specified radius.
rad = km2rad(km,sphere)
converts distances from kilometers to radians, as measured along a great circle on a
sphere approximating an object in the Solar System.
Sphere approximating an object in the Solar System, specified as one of the following
values: 'sun', 'moon',
'mercury', 'venus',
'earth', 'mars', 'jupiter',
'saturn', 'uranus',
'neptune', or 'pluto'. The value of
sphere is case-insensitive.
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