For the first time, he began to calculate the precise latitude and longitude of the surrounding milieu.

Until the mid-1750s, accurate navigation at sea out of sight of land was an unsolved problem due to the difficulty in calculating longitude.

"He has promised to teach me to take observations and calculate latitude and longitude and I intend to improve the opportunity!"

It is also responsible for calculating latitude and longitude.

In order to calculate longitude a sailor would need to know the time difference between his current location and a fixed point somewhere on earth, usually the port of call.

Molesworth himself earned the respect of Sir Isaac Newton when he invented a chronometer for calculating longitude.

So she starts calculating longitude and latitude, distance and mileage.

An example of this is devices that calculate latitude and longitude by receiving signals from the Pentagon's Navstar Global Positioning System satellites.

Importantly, Harrison showed everyone that it could be done by using a watch to calculate longitude.

There he made calculated the latitude and longitude of his native town (see infra).