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Vocabulary Entry
sidereal
|adjective • noun
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A
adjective
Relating to the stars or celestial bodies.
Example Sentences
"The sidereal month is roughly 27.3 days long, which is the time it takes for the Moon to orbit Earth relative to the stars."
"Astronomers use sidereal time to track the position of stars in the night sky."
"The concept of sidereal days is important for understanding how Earth rotates in relation to distant stars."
N
noun
A measurement of time based on the apparent motion of the stars, specifically relating to the time it takes for a star to return to the same position in the sky.
Example Sentences
"The definition of a sidereal day differs from that of a solar day."
"In astronomy, a sidereal year defines the time it takes Earth to orbit the Sun relative to distant stars."
"The observatory calculated the sidereal time for various celestial events."