outer+boundary
131Oort Limit — The Oort limit has two definitions:1 the outer boundary of the Oort cloud. The current estimate is about 100,000 astronomical units (15 trillion km, or 1.5 lightyears) from the Sun, which is approximately 1/3 of the distance to the nearest star… …
132Chamberlin trimetric projection — A map of Africa using the Chamberlin trimetric projection. The three red dots indicate the selected base locations: (22°N, 0°), (22°N, 45°E), (22°S, 22.5°E). 10° graticule. The Chamberlin trimetric projection is a map projection where three… …
