projector.py 文件源码

def ang2const(lon,lat,coord='gal'):
    import ephem

    scalar = np.isscalar(lon)
    lon = np.array(lon,copy=False,ndmin=1)
    lat = np.array(lat,copy=False,ndmin=1)

    if coord.lower() == 'cel':
        ra,dec = lon,lat
    elif coord.lower() == 'gal':
        ra,dec = gal2cel(lon,lat)
    else:
        msg = "Unrecognized coordinate"
        raise Exception(msg)

    x,y = np.radians([ra,dec])
    const = [ephem.constellation(coord) for coord in zip(x,y)]
    if scalar: return const[0]
    return const