600,000 mm if im not mistaken.
At the Earth's North Pole, the north celestial pole is directly overhead, and all stars that are visible at all (that is, all stars in the northern celestial hemisphere) are circumpolar. As one travels south, the north celestial pole moves towards the northern horizon
-2 for O
-1 for F
0 for N2
+1 for Li
+3 for Fe
