[1] (页面存档备份,存于互联网档案馆) and [2] (页面存档备份,存于互联网档案馆) give Vastitas Borealis starting at 54.7°N and Planum Boreum at 78.5°N. The radius of Mars is approximately 3400 km, so
[1] (页面存档备份,存于互联网档案馆) and [2] (页面存档备份,存于互联网档案馆) give Vastitas Borealis starting at 54.7°N and Planum Boreum at 78.5°N. The radius of Mars is approximately 3400 km, so