**Geocentric** parallax is the angle between the direction of the body as seen from the surface of the earth and the direction in which it appears from the centre of the earth.

According To The Best Determinations Of Modern Astronomy (Le Verrier'S Solar Tables, Paris, 1858, P. 102), The Mean **Geocentric** Motion Of The Sun In Longitude, From The Mean Equinox During A Julian Year Of 365.25 Days, The Same Being Brought Up To The Present Date, Is 360 0 27" 685.

Thus The Corresponding Relative Mean **Geocentric** Motion Of The Moon From The Sun Is 12 X360 { 477616" 724; And The Duration Of The Mean Synodic Revolution Of The Moon, Or Lunar Month, Is Therefore 1236776072 25 = 29'530588 Days, Or 29 Days, 12 Hours, 44 Min.

Co-ordinates referred to.a point of observation as the origin are termed " apparent," those referred to the centre of the earth are " **geocentric**," those referred to the centre of the sun, " heliocentric."

The longitudes and latitudes thus defined are **geocentric**, and the latitude is slightly different from that in ordinary use for geographic purposes.

The choice made by Hipparchus of the **geocentric** theory of the universe decided the future of Greek astronomy.

**GEOCENTRIC**, referred to the centre of the earth (Gr.

But the explanation of this phenomenon is equally consistent with the **geocentric** as with the heliocentric theory of the solar system.

But the observations do not extend continuously throughout the year, and do not include a sufficient length of the central line on each evening to enable us to distinguish certainly the heliocentric latitude of the central line, as distinct from its apparent **geocentric** position.

The **geocentric** latitude of a place is the angle which the line from the earth's centre to the place makes with the plane of the equator.

1294), and indeed all men of leading had accepted as a fact and not a mere hypothesis the **geocentric** system of the universe and sphericity of the globe, the authors of maps of the world, nearly all of whom were monks, still looked in the main to the Holy Scriptures for guidance in outlining the inhabited world.

(2) A theorem relating to the apparent curvature of the **geocentric** path of a comet.

The relation of **geocentric** to apparent co-ordinates depends upon the latitude of the observer.