7 articles for "Prime"

**Prime Meridian**[Astri*Index]

The great circle that passes through the Earth's poles and the Old Observatory at Greenwich, England. This is the basic reference circle for longitudes on the Earth, and for the distribution of time signals.

See also:

♦ Greenwich ♦ Great Circle

**Prime Meridian**[Munkasey M]

The Meridian or Hour Circle which passes throughGreenwich, England, from where all terrestrial longitude is measured.

See also:

♦ Greenwich ♦ Great Circle

**Prime Vertical**[Astri*Index]

The *great circle* which passes through the East and West points of the *Horizon*, and the *Zenith* and *Nadir* of a particular location. The Prime Vertical is perpendicular to both the Horizon and the *Meridian*.

See also:

♦ East Point ♦ Great Circle ♦ Horizon ♦ Zenith ♦ Nadir ♦ Meridian

**Prime Vertical**[Prima]

The great circle that passes through the east point, and its diametrical opposite, the west point (both points are located on the horizon), as well as through the zenith and its diametrical opposite, the nadir. It is perpendicular to both the horizon and the meridian.

An observer standing upright and facing south would be standing in the plane of the prime vertical.

See also:

♦ East Point ♦ Great Circle ♦ Horizon ♦ Zenith ♦ Nadir ♦ Meridian

**Prime Vertical**[Munkasey M.]

A great circle of the Celestial Sphere used in theHorizon system of coordinates and formed at the intersecting points of a circle drawn through the Zenith, Nadir, and the East and the West points of the Horizon.

See also:

♦ East Point ♦ Great Circle ♦ Horizon ♦ Zenith ♦ Nadir ♦ Meridian

**Prime Vertical**[DeVore]

The vertical circle that lies at right angles to the meridian, and passes through the East point, Zenith, West point and Nadir of any place.

See also:

♦ East Point ♦ Great Circle ♦ Horizon ♦ Zenith ♦ Nadir ♦ Meridian

**Prime Vertical Chart**[Astro*Index]

A variation of the *Prime Vertical Mundoscope* used by Michael Erlewine for relocation work, which places the zero-point at the *East Point* of the *Horizon*, rather than at the Upper *Meridian*.

See also:

♦ Erlewine, Michael ♦ East Point ♦ Horizon ♦ Meridian

Astro*Index Copyright © 1997 Michael Erlewine

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