2 articles for "Semi-Diameter"

**Semi-Diameter**[Astro*Index]

One-half the observed angular width of a body, usually measured in degrees and minutes. Identical to the observed angular radius of a body. The Semi-diameter of the Sun at mean distance is 15'59.63"; the Moon's semi-diameter is 15'32.6" at mean distance.

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♦ Astronomy

**Semi-Diameter**[Munkasey M.]

One-half of the standard width of a visible body measured in degrees and minutes. The average semi-diameter of the Sun is sixteen minutes of arc, and of the Moon is 14.8 minutes of arc.

See also:

♦ Astronomy

Astro*Index Copyright © 1997 Michael Erlewine