Duration of Totality of Solar Eclipses at Greenwich

Computer Science

Scientific paper

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Scientific paper

IN NATURE (vol. lxii. p. 64 and p. 86) will be found an estimate of the maximum duration of totality for a solar eclipse under the most favourable conditions, the result being 7m. 40s. for a place in north latitude 4° 52'. For Greenwich I estimate the maximum duration at 5m. 47s. There is good evidence for believing that the ``Nautical Almanac'' diameter of the moon, used in computing eclipses, is too large. It is almost exactly 2160 miles, and should be reduced probably to 2158 miles. This reduction would alter the above estimates to 7m. 34s. and 5m. 42s. respectively. That all the conditions necessary to produce the maximum totality of 5m. 42s. will ever be simultaneously satisfied for Greenwich is extremely improbable.

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