Kids Research Express
Free Online Encyclopedia For Research in Science, Health, Environment and Technology
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Animals
Earth, Climate and Environment
Health and Medicine
Matter and Energy
Plants
Science, Technology & Discoveries
Space and Time
The Human Body
Space & Time
celestial meridian
Celestial meridian,
vertical circle
passing through the north celestial pole and an observer's
zenith
. It is an axis in the
altazimuth coordinate system
.
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