Irving, [Christopher], d. 1856. [from old catalog], Ortmann, Anselm. [from old catalog] · Baltimore, Md., New York, J. Murphy company · leaf 14
an you give an example of this motion?A. When riding in a train, the trees, houses and INTRODUCTION. other objects near by seem to move in a contrarydirection to that of the train. Apparent Motions of the Planets—Direct, Retrogradeand Stationary. Q. 12. What is meant by the direct motion of aplanet… … Fig. 1. Apparent Motion of a Planet.E represents the Earth, M a planet, and P, Pi, Pn, the apparentpositions of this planet among the stars. Q. 14. What is the retrograde motion of a planet ?A. A planet has retrograde motion when its appar-ent motion among the stars is westward. Q. 15. When does a…
Astronomy
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