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Welcome to the astropy-helpers wiki!. I have the data for some Known nearby SNRs located within a distance 1.5 kpc from the Earth in (l,b). I am trying to use these coordinate in Cartesian coordinate. logically if you want to convert it to xy all these sources should located within 1.5kpc from the Earth But I do not know which function I have to use. I have found many formula. every one gives different answer Could you please help at this point.

Many thanks.