The elements of astronomy; a textbook . 30. — Determination of the Moons Parallax. 96 PARALLAX, DISTANCE, AND VELOCITY. [§150 150. Parallax, Distance, and Velocity of the Moon. — The moons equatorial horizontal parallax is found to (57 ), according to Neison, but varies consider-ably on account of the eccentricity of the orbit. With thisvalue of the parallax we find that the moons average distancefrom the earth is about times the earths equatorialradius, or 238,840 miles, with an uncertainty of perhaps 20miles. The maximum and minimum values of the moons distance aregiven
The elements of astronomy; a textbook . 30. — Determination of the Moons Parallax. 96 PARALLAX, DISTANCE, AND VELOCITY. [§150 150. Parallax, Distance, and Velocity of the Moon. — The moons equatorial horizontal parallax is found to (57 ), according to Neison, but varies consider-ably on account of the eccentricity of the orbit. With thisvalue of the parallax we find that the moons average distancefrom the earth is about times the earths equatorialradius, or 238,840 miles, with an uncertainty of perhaps 20miles. The maximum and minimum values of the moons distance aregiven by Neison as 252,972 and 221,614. It will be noted that theaverage distance is not the mean of the two extreme distances. Knowing the size and form of the moons orbit, the velocityof her motion is easily computed. It averages 2287 miles anhour, or about 3350 feet per second. Her apparent angularvelocity among the stars is about 33 an hour on the average,which is just a little greater than the apparent diameter of themoon Fig. 31. — Moons Path relative to the Sim.
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