sidereal
si-de-re-al
adjective
Relating to, or measured by means of, the distant stars.
"A sidereal day is shorter than a solar day."
Thesaurus
Antonyms: civil
si-de-re-al
Relating to, or measured by means of, the distant stars.
"A sidereal day is shorter than a solar day."
Antonyms: civil