...applied for refraction and parallax, all the heavenly bodies are referred to the positions in which they would be seen by an observer at the centre of the earth, by means of rays coming to the eye without any deflexion. But it is to be remembered that the positions...

...above noticed have beeu eliminated from the discussion. CHAPTER IV. REDUCTION OF OBSERVATIONS TO TIIE CENTRE OF THE EARTH. 87. THE places of stars given...by an observer at the centre of the earth, and are called^reow^n'c, or true, places. Those observed from the surface of the earth are called observed,...

...correspond as nearly as possible to the true normal of the regular ellipsoid; the geodetic latitude being the angle which this normal makes with the plane of...remarked, however, that the geocentric places of the Ephemcris are also called apparent places when it is intended to distinguish them from mean places,...

...distance between the position of the moon as seen by the observer and the position in which the moon would be seen by an observer at the centre of the earth, is called the parallax of the moon, and the angle which the radius of the earth subtends at the moon...

...the moon among the stars. The almanac LONGITUDE. 81 place, however, is the place at which the moon would be seen by an observer at the centre of the earth, and consequently the actual observations are in most cases complicated with very disagreeable reductions...

...be safely made until the anomalous deviations of the plumb line above noticed have been eliniiuated from the discussion. CHAPTER IV. REDUCTION OF OBSERVATIONS...are also called apparent places when it is intended * See Attr. Nach. No. 1303. to distinguish them from mean places, a distinction which will he considered...

...eliminated from the discussion. CHAPTER IV. REDUCTION OF OBSERVATIONS TO THE CENTRE OF THE EARTH. 87. THB places of stars given in the Ephemerides are those...are also called apparent places when it is intended * See A.HT. Nach. No. 1303. to distinguish them from mean places, a distinction which will be considered...

...greater accuracy than (50). PARALLAX. 25. The geocentric, or true, place of a star is that in which it would be seen by an observer at the centre of the earth. The apparent,* or observed, place is that in which it is seen by the observer on the surface of the...

...GEOCENTRIC. Or. ge, the earth, and centron, the centre. In astronomy the position of a celestial body as it would be seen by an observer at the centre of the earth is said to be its geocentric position, in opposition to its apparent position as seen by an observer...

...determine the place of the moon among the stars. The almanac place, however, is the place at which the moon would be seen by an observer at the centre of the earth, and consequently the actual observations are in most cases complicated with very disagreeable reductions...