[AstroPy] Calculating alt/az or zenith angle/parallactic angle

[Erik Tollerud]

Hi Francisco,


> I think we discarded Skycoord due to the speed so we used PyEphem.

Can you give a bit more on the specific use case that led you to this
decision?  SkyCoord has a fair amount of space for optimization, so it
would be useful to know what kinds of use cases are coming out as "slow" so
we can try to make them better.


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Erik T
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