Surveyors in the 16th century could measure latitude with great accuracy, but measuring longitude was much more difficult, mainly because there were not instruments for giving:

Question

Geography

Winston Osborn

6 January, 22:33

Surveyors in the 16th century could measure latitude with great accuracy, but measuring longitude was much more difficult, mainly because there were not instruments for giving:

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Mike Valdez · Answer 1

The problem of determining longitude on land was solved, but the method was useless at sea because ship’s movement made it impossible to time the eclipses of Jupiter’s moons.