# When was how to accurately calculate longitude invented?

When was how to accurately calculate longitude invented? In 1530, mathematician Gemma Frisius proposed a method of calculating longitude with a clock: It would be set upon departure and kept at absolute time, which could be compared with the time upon arrival. Sufficiently accurate clocks, unfortunately, weren’t to be made available for 230 more years.

When was longitude determined? Eratosthenes in the 3rd century BCE first proposed a system of latitude and longitude for a map of the world.

Who first calculated longitude? Hipparchus, a Greek astronomer (190–120 BC), was the first to specify location using latitude and longitude as co-ordinates.

How was longitude figured out? In principle, you could tell your longitude by observing the angle between the Moon and a particular star then consulting an almanac, which catalogued the time at Greenwich based on the position of a range of celestial objects. And then your longitude can be determined by comparing Greenwich time with your local time.

## When was how to accurately calculate longitude invented? – Related Questions

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