5 articles for "Circle"

**Circle**[DeVore]

The complete circle of the zodiac, or 360 degrees of 60 minutes each.

See also:

♦ Astronomy ♦ Zodiac

**Circle of Equal Altitude**[Astro*Index]

A *small circle*, on the *celestial sphere*, which is everywhere equidistant from the Horizon.

See also:

♦ Almucantar ♦ Small Circle ♦ Celestial Sphere

**Circle of Equal Altitude**[Munkasey M.]

A circle which is everywhere equidistant from a pole.

See also:

♦ Almucantar ♦ Small Circle ♦ Celestial Sphere

**Circle of Position**[Astro*Index]

A circle of equal *zenith distance*; equivalent to an *almucantar*. Two or more intersecting circles of position are used by navigators to specify position at sea.

See also:

♦ Zenith Distance ♦ Almucantar

**Circle of Position**[DeVore]

Circles intersecting the horizon and meridian, and passing through a star: in terms of which to express the position of the star. Their use is now obsolete. However, Circles of Position were not so used by Ptolemy or Placidus, who measured the distance of every star by its semi-arc.

See also:

♦ Zenith Distance ♦ Almucantar

Astro*Index Copyright © 1997 Michael Erlewine

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