[AstroPy] point in ellipse

[gonghang.naoc]

hi，everybody，
     I believe many people here use ds9 and know  its region file
format.For example，we can make an ellipse if we know its center ra，dec and
main aixs direction.Is there a pythonic way to judge whether a point is in
an ellipse if we know ra&dec of the point？
     Thank you.
     Best wishes.
     Hang
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