sidereal
/saɪˈdɪəriəl/
adjective
Origin
Latin
sīdereus — starry, of the stars
Overview
Meaning Now
- Relating to the stars or constellations; determined by or referred to the stars.
- Measured by the apparent motion of the stars rather than the sun.
Literal older meaning
of or relating to a star
Language path
Latin → English
Earliest form
sidereall
Earliest period
17th century
Journey
The term emerged in English scientific discourse during the 17th century to provide a precise distinction between solar time and star-based timekeeping, which was essential for burgeoning astronomical navigation and cartography.
Evolution
- Proto-Indo-European
*sider-
“star/heavenly body”
- Latin
sīdus
“star, constellation”
Base noun from which adjectives are derived
- Late Latin
sīdereus
“starry”
- Early Modern English
sidereall
“relating to the stars”
Connections
Word parts
sīder-
root
star
-eus
suffix
pertaining to
-al
suffix
characterized by
Related across languages
French
sidéral
sidereal
Spanish
sideral
sidereal
Explore next
Related to sidereal
External references use DefinedTerm semantics.