Besonderhede van voorbeeld: 3930742526954037228

English

This motivated Hadley to tackle the problem and in 1730 he invented the reflecting octant which measured the altitude of the sun or of a star.

Chinese

这种动机哈德利来解决这个问题和1730年他发明了反映八分仪测量的海拔高度的太阳或恒星。