Just as on the day before, Captain Nemo came to take the altitude of the sun.

尼摩船长就像前天那样出来测定太阳的高度。

Raising his sextant, Captain Nemo took the altitude of the sun, which would give him his latitude.

尼摩船长带了他的六分仪，测量太阳的高度，因此可以。知道船所在的纬度。