Phrase guide

sidereal time

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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  • /saɪˈdɪə.ɹiəl taɪm/
  • /səɪˈdɪə.ɹiəl taɪm/

1

noun

Meaning 1

Time measured by the apparent diurnal motion of the vernal equinox; approximated by that based on the rotation of planet Earth relative to the seemingly fixed stars.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: astronomy, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

measured by the diurnal motion of stars

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: cosmic time

Narrower terms: sidereal day, day, sidereal year, sidereal hour, sidereal month

History

Etymology

No etymology was provided for this word.

Across languages

Translations

14 source translations are retained for this English entry.

  • Chinese Mandarin: 恆星時 /恒星时 (héngxīngshí) — time measured by apparent motion of vernal equinox
  • Finnish: tähtiaika — time measured by apparent motion of vernal equinox
  • French: temps sidéral — time measured by apparent motion of vernal equinox
  • German: Sternzeit — time measured by apparent motion of vernal equinox
  • Greek: αστρικός χρόνος (astrikós chrónos) — time measured by apparent motion of vernal equinox
  • Hindi: तारा काल (tārā kāl) — time measured by apparent motion of vernal equinox
  • Irish: am na réaltaí — time measured by apparent motion of vernal equinox
  • Japanese: 恒星時 (kōseiji) — time measured by apparent motion of vernal equinox
  • Polish: czas gwiazdowy — time measured by apparent motion of vernal equinox
  • Romanian: timp sideral — time measured by apparent motion of vernal equinox
  • Romanian: oră siderală — time measured by apparent motion of vernal equinox
  • Russian: звёздное вре́мя (zvjózdnoje vrémja) — time measured by apparent motion of vernal equinox
  • Turkish: yıldız zamanı — time measured by apparent motion of vernal equinox
  • Ukrainian: зо́ряний ча́с (zórjanyj čás) — time measured by apparent motion of vernal equinox