descending node

descending node

 
noun Astronomy.
the node through which an orbiting body passes as it moves to the south (opposed to ascending node).
Origin:
1690–1700
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Descending node is always a great word to know.
So is light-year. Does it mean:
the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km)
the gaseous envelope surrounding a heavenly body
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
WordNet
descending node

noun
the point at which an orbit crosses the ecliptic plane going south [ant: ascending node] 
WordNet® 3.0, © 2006 by Princeton University.
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