SPIN OUR MIND RIGHT ROUND RIGHT ROUND

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It's hard to describe in words why a sidereal day, the time it takes for Earth rotate on its axis with respect to the stars, is shorter than a solar day, which is 24 hours and the day our clocks operate on. This animation helps break it all down.

[Via Reddit]

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SEEING IS BELIEVING

Long before we got this funny idea that maps had to be truthful, before Edney's ideal of cartography took hold, maps were full of conjectures, rumors, mistakes in surveying and even some outright frauds.

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