Say pleases is it possible using AstroPy to transform ITRS(International Terrestrial Reference System) to ICRS(International Celestial Reference System)? I have read the documentation and understand how to do ICRS to ITRS conversions, but not sure how to go the other way.
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Likely, did you read the docs? – MSeifert Sep 23 '17 at 13:02
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Yes, from ICRS to ITRS i can do transformation but vice versa i have no idea – Антон Достоевский Sep 23 '17 at 13:14
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If the transformation is a matrix, simply invert it. – Sep 24 '17 at 14:39
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All of the transformations implemented in Astropy are bi-directional (see, e.g., the transform graph that visualizes the possible transformations). So, yes, it is possible to transform from the ITRS to the ICRS frame. You have to create an instance of the ITRS class by specifying the Cartesian coordinates of the point of interest. For example:
import astropy.coordinates as coord
import astropy.units as u
itrs = coord.ITRS(x=150*u.km, y=300*u.km, z=-210*u.km)
Then you can transform to the ICRS frame with:
icrs = itrs.transform_to(coord.ICRS)
ampw
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