Nautical science in its relation to practical navigation, together with a study of the tides and tidal currents (1910)
Poor, Charles Lane, 1866- · New York, London, G. P. Putnam's sons · leaf 154
Tinje and its Determination 121 sun, noon will fall some 30 seconds later than the previous. This will go on vintil by the middle of February noon by the sun is 14^ minutes late by the clock. At this date the true and the solar days are of exactly the same length, but after this date the solar day… … This difference between the apparent or sun time and the mean or clock time is called the "equation of time." It is zero four times a year, namely, on April 15, June 14, Sept. i, and Decem- ber 24. On February 11, as has been seen, the sun time is late by nearly 14J minutes, and again on July 26…
Nautical astronomy
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