sidereal
/saษชหdษชษนi.ษl/IPA: /S IH1 D IH1 R IY0 AH0 L/
adjective
- 1
Of or relating to the stars.
- 2
Relating to a measurement of time relative to the position of the stars.
- 3
Relating to a measurement of time relative to the point of the vernal equinox.
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