Hello,
In the "Find images in the same area" menu, what is the formula for finding the distance?
Is it a simple application of the Pythagorean theorem in the plane or is it a calculation based on spherical geometry?
Thanks
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Hi Francis,
it's nothing that complicated.
Given an image with RA center X and dec center Y, and a "look around value" of n degrees, it finds all images where:
center RA <= X - n/2 <= X + n/2
center dec <= Y -n/2 <= Y + n/2
Source code here:
https://github.com/astrobin/astrobin/blob/master/astrobin_apps_platesolving/services/solution_service.py#L90 |
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I've looked into the matter and it seems to me that there's an error in the calculation when ra is around 0.
For example, with ra = 1 and degree = 4, the calculation (ra_min = ra - degrees * .5) gives -1 when the correct result should be 359.
The same problem applies to dec around ±90°.
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Francis Moreau:
I've looked into the matter and it seems to me that there's an error in the calculation when ra is around 0.
For example, with ra = 1 and degree = 4, the calculation (ra_min = ra - degrees * .5) gives -1 when the correct result should be 359.
The same problem applies to dec around ±90°.
Thanks! Will add this to the internal issue tracker.
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| @Francis Moreau, this is now live on AstroBin. Thanks again for reporting!
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