Symzonia: Voyage of Discovery

I told them all to be perfectly at ease, for that I knew what I was about; that I could calculate every point of the compass as well as if that instrument performed its office; that we would heave to for the night, the occurrence of which was no more than I had calculated on; and finally, to give them confidence in my skill, told them, that if we did not find the sun directly over head at noon, within two days, provided no land impeded our progress, I would give up the command to Albicore, and show him the way back to Seaborn's Land. Albicore and Slim both earnestly entreated that I would instruct them how to calculate the points of the compass, if I possessed that important knowledge, so that they might be enabled to find their way back again in case any accident should befal me. I begged to be excused, choosing to keep the staff in my own hands. The truth was, having three excellent chronometers, one set to the time at Washington, one to that of Greenwich, and the other to that of Rio de Janeiro, and also an excellent watch daily regulated, which gave me the ship's diurnal time accurately, I could easily calculate my longitude, and the point on which the sun ought to bear every hour in the 24. With these calculations before me, I had but to look at my watch and the sun to determine my course. Thus in the longitude of Greenwich, when the chronometer set to Greenwich time stood at 12 o'clock noon, wherever the sun was, was north; and when that chronometer stood at midnight, wherever the sun was, was south--on the external southern hemisphere, south of the degree of the sun's declination.