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Thursday, October 17, 2019

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  • Maritime Musings (2) (X)

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Perihelion

Posted to Maritime Musings (by Dennis Bryant) on January 4, 2011

The whoosh you experienced at about 1900 UTC on Monday, January 3, 2011 was the sun passing by on its closest approach to the Earth – a mere 91,402,505 miles away. This recurs every year, often at night when it can’t be observed. The date and…

Prime meridian

Posted to Maritime Musings (by Dennis Bryant) on November 27, 2009

The parallels of latitude are fixed by the rotation of the Earth. The only human involvement is the use of a 360 degree circle, starting at the equator. The degrees of longitude, although using the same 360 framework, could be commenced from…