he observer; and thisparallax is called horizontal parallax. Hereafter, when wespeak of the parallax of a body, horizontal parallax is to beunderstood, unless otherwise expressed. A clear and summary illustration of parallax in general, isgiven by Fig. 13. Horizontal Fig> 13 J^et Q ^q parallax.… … PARALLAX. 63 direction of Z P, or Zp\ and the difference in direction, of Chap. ii.these two lines, is parallax. When P is in the zenith, thereis no parallax; when P is in the horizon, the angle Z P C isthen greatest, and is the horizontal parallax. We now perceive that the horizontal parallax of…
Astronomy
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