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Dan Heim taught physics and mathematics for 30 years — more if you count his grade-school science club.Since 1999, he's been a freelance writer and creates educational computer graphics and animations.It's a story that bridges geography, history and astronomy — stick with it to the end, and you will understand the IDL.Plus, you'll be able to answer those six questions posed above.The vertical axis measured "latitude," and the horizontal axis "longitude." Though prescient, his idea languished for over a millennium.
People relied on the definition that "noon" was when the Sun was highest in the sky, and due south.
The idea of a DIY open source loom is one that not only artists could benefit from but many individuals and learning centers could gain a resource by building one of these looms as well.
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In the nineteenth century, the emergence of transcontinental railroads further complicated matters.
That century also saw accurate mechanical timepieces becoming widely available.