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:
“The pressures of being a parent are equal to any pressure on earth. To be a conscious parent, and really look to that little being’s mental and physical health, is a responsibility which most of us, including me, avoid most of the time because it’s too hard.”
—John Lennon (1940–1980)
“There is no legislation—I care not what it is—tariff, railroads, corporations, or of a general political character, that all equals in importance the putting of our banking and currency system on the sound basis proposed in the National Monetary Commission plan.”
—William Howard Taft (1857–1930)