Here we provide an overview of the package and associated framework. More detailed information and justification of the design is available inĪPE (Astropy Proposal for Enhancement) 5. See IERS data access () for details of this process. These Earth rotation values are automatically downloadedįrom the International Earth Rotation and Reference Systems (IERS) service when Rotation information (UT1-UTC offset and/or polar motion) when transforming Some coordinate frames such as AltAz require Earth This, see Determining and plotting the altitude/azimuth of a celestial object. Possible to convert from celestial coordinates toĪltAz coordinates, allowing the use of Sk圜oordĪs a tool for planning observations. transform_to ( FK5 ( equinox = 'J1975' )) # precess to a different equinox transform_to ( 'fk5' ) # c_icrs.fk5 does the same thing > c_fk5 > from ordinates import FK5 > c_fk5. That contain the data, Sk圜oord objects can be sliced, reshaped, etc.,Īnd can be used with functions like numpy.moveaxis, etc., that affect the To apply the same operation to many different coordinates (say, from aĬatalog), this is a better choice than a list of Sk圜oord objects,īecause it will be much faster than applying the operation to each They store multiple coordinates in a single object. These work in the same way as single-value coordinates, but Sk圜oord and all other coordinates objects also supportĪrray coordinates. In the value (e.g., '+41d12m00s'), or via the unit keyword. Quantity object (e.g., 10.5*u.degree), by including them The coordinate frame keyword is optional because it defaults toĪngle units must be specified for all components, either by passing in a Via keyword arguments like ra and dec, or l and b (depending The examples above illustrate a few rules to follow when creating aĬoordinate values can be provided either as unnamed positional arguments or
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