Page:Sailing Alone Around the World (Slocum).djvu/169

Rh was carried on a vast stream where I felt the buoyancy of His hand who made all the worlds. I realized the mathematical truth of their motions, so well known that astronomers compile tables of their positions through the years and the days, and the minutes of a day, with such precision that one coming along over the sea even five years later may, by their aid, find the standard time of any given meridian on the earth.

To find local time is a simpler matter. The difference between local and standard time is longitude expressed in time—four minutes, we all know, representing one degree. This, briefly, is the principle on which longitude is found independent of chronometers. The work of the lunarian, though seldom practised in these days of chronometers, is beautifully edifying, and there is nothing in the realm of navigation that lifts one's heart up more in adoration.