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Zero degrees longitude (0°) is called the prime meridian.

The degrees of longitude run 180° east and 180° west from the prime meridian.

His speech provided the impetus for the so-called Marshall Plan, under which the United States sent billions of dollars...

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Latitude is measured from 0° to 90° north and 0° to 90° south—90° north is the North Pole and 90° south is the South Pole.

Imaginary lines, also called meridians, running vertically around the globe.

Imaginary lines running horizontally around the globe.

Also called parallels, latitude lines are equidistant from each other.

On this day in 1723, Adam Smith, future author of The Wealth of Nations (1776), a critique of the mercantilist model of trade in the British empire, is baptized in Kirkcaldy, Scotland.

Smith, the father of political economy—or the relationship between a society and its economic system–was born in the village...

It’s calculated as 40 weeks after the first day of your last period.

Your midwife may update your due date following your dating scan, which gives a more accurate picture of how far along in your pregnancy you are.

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