celestial meridian


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celestial meridian

n.
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The basic principle was that there would be a team of observers, each of whom maintained continuous watch during the observing session of a specified sky area lying on the celestial meridian.
Heilbron's title refers specifically to the precise projections of the celestial meridian on a spate of church floors during this period (and well into the nineteenth century).
Our map's celestial meridian is really an arc that vaults the sky from the south side of the horizon to the north.