local meridian


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local meridian

[′lō·kəl mə′rid·ē·ən]
(astronomy)
The meridian through any particular position which serves as the reference for local time.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The lunar phase affects when the Moon crosses the local meridian (is due south), an event also called upper transit.
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Equatorially mounted telescopes track their celestial targets by rotating around an axis that points toward the pole and is aligned with the local meridian. Even unusual instruments, like the McMath-Pierce solar telescope on Kitt Peak in southern Arizona, take advantage of this principle.
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This is simply the right ascension of stars on your local meridian at any moment.
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Here the antenna remains fixed with respect to the Earth and pointed at the local meridian. The Earth's rotation causes the dish to scan a band of declination in the sky, making a full sweep in 24 sidereal hours.
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This procedure automatically aims the instrument at the local meridian, and you can set the mount's right-ascension circle to read the current sidereal time.
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