Time Equals Longitude
Since the Earth rotates at a steady rate of 360° per day, or 15° per hour (in mean solar time), there is a direct relationship between time and longitude. If the navigator knew the time at a fixed reference point when some event occurred at the ship's location, the difference between the reference time and the apparent local time would give the ship's position relative to the fixed location. Finding apparent local time is relatively easy. The problem, ultimately, was how to determine the time at a distant reference point while on a ship.
Read more about this topic: History Of Longitude
Famous quotes containing the words time and/or equals:
“... marathon swimming is the most difficult physical, intellectual and emotional battleground I have encountered, and each time I win, each time I touch the other shore, I feel worthy of any other challenge life has to offer.”
—Diana Nyad (b. 1949)
“If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut.”
—Albert Einstein (1879–1955)