Takes phase center and src l,m in radians to get ra,dec of source.
    Returns string ('hh mm ss', 'dd mm ss')

def source_location(pt_ra, pt_dec, l1, m1):
    """ Takes phase center and src l,m in radians to get ra,dec of source.
    Returns string ('hh mm ss', 'dd mm ss')
    """
    import math

    srcra = np.degrees(pt_ra + l1/math.cos(pt_dec))
    srcdec = np.degrees(pt_dec + m1)

    return deg2HMS(srcra, srcdec)