def get_RaDecOffsets(ra1_deg, dec1_deg, ra2_deg, dec2_deg):
    delta_ra_deg = ra1_deg - ra2_deg
    adj = math.cos(math.radians(dec2_deg))
    if delta_ra_deg > 180.0:
        delta_ra_deg = (delta_ra_deg - 360.0) * adj
    elif delta_ra_deg < -180.0:
        delta_ra_deg = (delta_ra_deg + 360.0) * adj
    else:
        delta_ra_deg *= adj

    delta_dec_deg = dec1_deg - dec2_deg
    return (delta_ra_deg, delta_dec_deg)
Calculate offset.
dataset/ETHPy150Open ejeschke/ginga/ginga/util/wcs.py/get_RaDecOffsets