Dating on line for dummies


18-Jun-2018 19:50

Before we explain how time zones solved these clock problems, let's do a quick review of latitude and longitude. C., Hipparchus of Nicea, a Greek mathematician and astronomer, proposed a global grid of longitude and latitude lines to measure position.It was a coordinate system for locating points on the surface of a sphere.In 1851, England designated the Prime Meridian (0 degrees longitude) as the meridian running through Greenwich Observatory.They were the dominant seafaring nation in that era, had colonies around the globe, were using state-of-the-art mechanical clocks, and were scientifically qualified to establish a standard.It's mostly about convenience, commerce, and politics.

dating on line for dummies-67

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And of course, to use either system effectively, it's helpful to know the clock times at both the sender's and receiver's locations.

The first such system, using 24 standard time zones, was proposed by Sir Sandford Fleming in 1876.

Sandford was a Scottish engineer, who helped design the Canadian railway network.

The vertical axis measured "latitude," and the horizontal axis "longitude." Though prescient, his idea languished for over a millennium.

During the Age of Discovery, beginning in the 15th century, cartographers saw the need for standardized latitude and longitude measurement.The International Date Line (IDL) is an imaginary — and arbitrary — line on Earth's surface that runs from the North Pole to the South Pole. If you cross it traveling westward, the day goes forward by one, and the date increases by one.If you cross it traveling eastward, the opposite occurs.That century also saw accurate mechanical timepieces becoming widely available.