angle hoek 角度 supergalactic longitude SGL The angular distance on the celestial sphere measured clockwise from the supergalactic centre (as defined by the International Astronomical Union (IAU)) along the supergalactic equator to the intersection with the great circle drawn from the supergalactic north pole through the object. degree graad 度 minute (angle) minuut (hoek) 分钟（角） second (angle) seconde (hoek) 秒（角度）