1. the great circle on the celestial sphere midway between the celestial poles
  1. relating to the vicinity of the equator
  2. relating to an equinox (when the lengths of night and day are equal)
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How To Use equinoctial In A Sentence

  • From the use of the gnomon there naturally grew up the conception of angular measurements; and with the advance of geometrical conceptions there came the hemisphere of Berosus, the equinoctial armil, the solstitial armil, and the quadrant of Ptolemy -- all of them employing shadows as indices of the sun's position, but in combination with angular divisions. Essays on Education and Kindred Subjects Everyman's Library
  • “Where the four circles, the horizon, the zodiac, the equator, and the equinoctial colure join; the last three intersecting each other so as to form three crosses, as may be seen in the armillary sphere. Paradise. Canto I
  • Accounts of the celestial sphere typically refer to other circles on its surface, including the arctic and Antarctic circles, the zodiac, tropics, and the solstitial and equinoctial colures.
  • Hence it became necessary to distinguish one from the other _by name_, and thus the notation from midnight gave rise, as I have remarked in one of my papers on Chaucer, to the English idiomatic phrase "of the clock;" or the reckoning of the clock, commencing at midnight, as distinguished from Roman equinoctial hours, commencing at six o'clock A.M. This was what Ben Jonson was meaning by attainment of majority at _six o'clock_, and not, as PROFESSOR DE M.RGAN supposes, "probably a certain sunrise. Notes and Queries, Number 214, December 3, 1853 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc.
  • The Orinoco, the Eio Magdalena, and the Congo or Zaire, are the only great rivers of the equinoctial region of the globe.
  • The two first stars named are exactly on what is called the equinoctial line. The Wonder Island Boys: The Tribesmen
  • Local storms at sea and strong equinoctial tides may affect whale migration routes that pass close to the coast.
  • Two great circles, the solstitial colure and the equinoctial colure, intersect at the celestial poles.
  • As one half of the ecliptic is north, and the other half south, of the equator, the line of intersection of their planes is at two points which are known as the equinoctial points, because, when the Sun on his upward and downward journey arrives at either of them the days and nights are of equal length all over the world. The Astronomy of Milton's 'Paradise Lost'
  • The equator is the line C, D, which upon the globe is a circle, and is sometimes called the equinoctial: Upon this circle the degrees of longitude are reckoned, beginning at C, and counting all round the globe till you come to C again; and O is the middle of the world between A and B, which are the two poles thereof: A representing the A Museum for Young Gentlemen and Ladies Or, a Private Tutor for Little Masters and Misses
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