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:
“Farewell deare flowers, sweetly your time ye spent,
Fit, while ye liv’d, for smell or ornament,
And after death for cures.
I follow straight without complaints or grief,
Since if my sent be good, I care not, if
It be as short as yours.”
—George Herbert (1593–1633)
“If an angel were ever to tell us anything of his philosophy I believe many propositions would sound like 2 times 2 equals 13.”
—G.C. (Georg Christoph)