mean sidereal time

noun

The hour angle between the meridian of Greenwich and the mean equinox of a specific date at Universal Time.

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Meanings

nounmean sidereal time (countable and uncountable, plural mean sidereal times)

plural mean sidereal times

  1. countableuncountableastronomyThe hour angle between the meridian of Greenwich and the mean equinox of a specific date at Universal Time.
Cite this entry
APA

mean sidereal time. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/mean%20sidereal%20time

MLA

“mean sidereal time.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/mean%20sidereal%20time. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “mean sidereal time,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/mean%20sidereal%20time.

Source: mean sidereal time on Wiktionary, CC BY-SA 4.0.