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I am curious how to compute the angle between the Moon's north node and Mars for any given day using PyEphem. For instance, in PyEphem, one can directly compute the angle between the moon and mars with the following:

print(ephem.separation(ephem.Moon("2016-01-02"),ephem.Mars("2016-01-02")))

But the question arises for the Moon's north node and Mars.

Any suggestion would be greatly appreciated.

Bono
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wangchun
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