Dusan Petricic
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Joan Dash, Dusan Petricic
By the start of the eighteenth century, many thousands of sailors had perished at sea because their captains had no way of knowing longitude, their east-west location. Latitude, the north-south position, was easy enough, but once out of sight of land not even the most experienced navigator had a sure method of fixing longitude. So the British Parliament offered a substantial monetary prize to whoever could invent a device to determine exact longitude at sea.
