Meaning ofsidereal yearin English

Noun

1. earth's orbit period; about 20.4 minutes longer than a tropical year
   The Earth takes approximately 365.25 days to complete one sidereal year.
   Synonyms:

   astronomical yearstellar year
   Antonyms:

   tropical year
2. earth's orbit period relative to fixed stars
   The sidereal year is used to calculate the positions of stars in the sky.
   Synonyms:

   stellar yeartropical year
   Antonyms:

   lunar yearsolar yearcalendar year
3. time for an object to orbit a star relative to distant stars
   A planet's sidereal year is the time it takes to complete one orbit around its star.
   Synonyms:

   stellar yearastronomical year
   Antonyms:

   lunar yearsolar yeartropical yearanomalistic yearcalendar year