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The Earth rotates 360 degrees every 24hrs, so breaking down, it rotates about 1 degree every 4mins, or 15 degrees per hour.

Once you work out the time the sun is at it's zenith (highest point) at GMT time you could work out the longitude by adding 1 degree for every minute, or 15 degrees per hour.

eg, in New York, the sun will reach it's zenith about 1700hrs GMT time. So that's 5hrs after 12noon GMT, 5hrs times 15 degrees per hour is 75 degrees longitude. (Looking at a map, it's about 73/74 degrees, so not bad calculations).

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7y ago

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