 | William Henry Smyth - Military art and science - 1867 - 836 pages
...To. To nullify a signal. ANNULAR. Resembling an annulus or ring. An annular eclipse takes place when the apparent diameter of the moon is less than that of the sun, and a zone of light surrounds the moon while central. the whole can be enlarged by a movable concentric... | |
 | Thomas Dick - Philosophy and religion - 1869 - 664 pages
...northern latitude; but an eclipse of the sun begins on the western side and ends on the eastern. 1. When the apparent diameter of the moon is less than that of the sun,, a portion of the sun's disk is projected around the body of the moon, forming a luminous ring. This... | |
 | Naval art and science - 1880 - 1054 pages
...Annul. To revoke; to rescind. Annular. Resembling a ring. ¿ and AN ANNVLAR ECI.IPSE takes place when the apparent diameter of the moon is less than that of the sun, and a ring of light surrounds the moon while central. A'c¿ria¿ Sctriza. A scupper in which the bole... | |
 | Sir Richard Gregory - Geomorphology - 1893 - 320 pages
...Eclipses. — If the moon passes exactly between the earth and the sun, as in a total eclipse, and the apparent diameter of the moon is less than that of the sun, it is evident that the whole of the sun's disc cannot be covered, and a ring of light will surround... | |
 | John Charles Duncan - Astronomy - 1926 - 474 pages
...situated on the line of centers of the Moon and the Sun may see a total solar eclipse; in the latter, the apparent diameter of the Moon is less than that of the Sun, and an observer on the line of centers may see a bright ring, or annulus of the Sun surrounding the... | |
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But since the mean synodic motion of the moon is at the rate of 30" per minute, it follows that the duration of a total solar eclipse can never exceed four minutes. 
