
The midheaven (MC) is a point of definition in the ecliptic coordinate system. It aims to find the part of the ecliptic that corresponds to the highest point in a celestial object`s apparent daily traverse of the visible sky, midway between its ascension on the eastern horizon and descension on the western horizon. The midheaven does not represen....
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http://en.wikipedia.org/wiki/Midheaven

• (n.) The midst or middle of heaven or the sky. • (n.) The meridian, or middle line of the heavens; the point of the ecliptic on the meridian.
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http://thinkexist.com/dictionary/meaning/midheaven/

the point Sun reaches in the sky at midday; a point where a line moving up from due south meets the ecliptic; top of the meridian; opening cusp of the tenth house, the point of social identity.
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http://www.encyclo.co.uk/local/20417
Mid'heav`en noun 1. The midst or middle of heaven or the sky.
2. (Astron.) The meridian, or middle line of the heavens; the point of the ecliptic on the meridian.
Found on
http://www.encyclo.co.uk/webster/M/64
No exact match found.