Construct · 1 fields · 1 citations

sidereal: a standalone construct

One name. One construct. A landmark on the map.

● anchor · one construct, one field Nearest construct by meaning·not indexed
sidereal1 CONSTRUCTSiderealSMART · STAR TIME

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Astronomy

Reckoned against the fixed stars, not the Sun

In astronomy "sidereal" means measured relative to the fixed stars rather than to the Sun. A sidereal day is Earth's rotation period against the stars (about four minutes shorter than the solar day, because the Earth also advances along its orbit) and sidereal time tracks which stars are currently overhead. Smart and Green's Textbook on spherical astronomy develops sidereal time as the hour angle of the vernal equinox, the timekeeping that tells an observer where to point. The referent is a star-referenced measure of rotation or period, as opposed to a Sun-referenced one.[1]

Unit
Elapsed rotation or orbital period reckoned against the fixed stars
Recovery means
Not applicable
Measured by
Reckoned as the hour angle of the vernal equinox (sidereal time); a sidereal day is about 23h 56m

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Nearby constructs

measure2 fields · 4 citationsjingle · one word, two constructsobserver4 fields · 6 citationsjingle · one word, four constructsorbit3 fields · 3 citationsjingle · one word, three constructs

References

  1. Smart, W. M., & Green, R. M. (1977). Textbook on spherical astronomy (6th ed.). Cambridge University Press. ISBN 9780521291804

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