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1 According to the remarks of Marcus, it appears probable that this sol-lunar period, as it has been termed, was discovered by the Chaldeans; Ajasson, ii. 306, 307.
3 "Hoc enim periodo (223 mensium) plerumque redeunt eclipses, non multum differentes, denis tamen gradibus zodiaci antecedentes;" Kepler, as quoted by Alexandre, in Lemaire, ii. 238.
4 The terms "sub terra" and "superne" are interpreted, by most of the commentators, below and above the horizon respectively; see Marcus in Ajasson, ii. 307.
5 "globo terræ obstante convexitatibus mundi." The term convexus, as applied to the heavens, or visible firmament, simply signifies arched; not opposed to concave, like the English word convex.
6 This point is discussed by Ptolemy, Magn. Const. vi. 6; "De distantia eclipticorum mensium." See also the remarks of Hardouin in Lemaire, ii. 260, 261; and of Poinsinet, i. 67.
7 These are styled horizontal eclipses; they depend on the refractive power of the atmosphere, causing the sun to be visible above the horizon, although it is actually below it. Brotier states, that eclipses of this description occurred on the 17th July, 1590, on the 30th November, 1648, and on the 16th January, 1660; Lemaire, ii. 260.
8 This is supposed to have been in the year 72 of our æra, when it is said that the sun was eclipsed, in Italy, on the 8th, and the moon on the 22nd of February; see Hardouin and Alexandre, in Lemaire, ii. 261.
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