Note 87 — Chapter VII · THE TIME AND PERIOD OF THE EVENT

The three periods of four months each, stated in this paragraph, are applicable to solar eclipses only; for lunar eclipses, these periods may be reckoned at ten days each; that number of days bearing the same proportion to a month, as four months to a year. On this point, Whalley, with his usual inaccuracy, has asserted, that “in eclipses of the Moon, two days, or thereabouts, are equal to the four months” here reckoned in eclipses of the Sun. He adds, however, what perhaps may be true, that “lunar eclipses are by no means so powerful as those of the Sun, although more so than any other lunation.”