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Royal Observatory Greenwich – postcard collection
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 Lines of latitude and longitude form the grid system used on globes, maps and charts. Latitude is a measure of how far north or south somewhere is from the Equator; longitude is a measure of how far east or west it is from the Prime Meridian. Each 15° of longitude is equivalent to a difference in time of one hour. Image courtesy of Andy Sinclair
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 lines-of-longitude

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