southing
/ˈsaʊðɪŋ/noun
mass noun
1- distance travelled or measured southward, especially at sea（尤指在海上的）南行航程。
1.1
- count noun a figure or line representing southward distance on a map地图上代表南行距离的数字或线。
1.2
- Astronomy the transit of a celestial object, especially the sun, across the meridian due south of the observer【天文】南中天。
1.3
- count noun Astronomy the angular distance of a star or other object south of the celestial equator【天文】南赤纬。