Sentences with phrase «sidereal day»
A Foucalt Pendulum, if it were accurate enough, would measure a sidereal day, not a solar day, since its movement is governed by an inertial frame of reference.
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So the periodic variation in the sidereal day length (not solar) is several hundred times LESS than the time a single frame appears in a movie.
In the more general case, when the orbit has some inclination and / or eccentricity, the satellite would appear to describe a more or less distorted figure - eight in the sky, and would rest above the same spots of the Earth's surface once per sidereal day.
A sidereal day — a day by the stars — is the time needed for a star to return to the same spot in the sky.
Not exact matches
Called sidereal time, the measurement calculates the length of a day by comparing the earth's rotation to the stars.
We pretend that romantic comedies or naturalistic thrillers set in the present day are more «realistic» than any that require us to remember that we live between immensities, for no more than a fraction of sidereal time in a world that we did not make.
The time taken by the sun to return to the same fixed star is called the Sidereal year, and consists of 365.2563612 solar days (or 365 days 6 hours 9 minutes 9.6 seconds).
True, sidereal LOD is converted to a mean solar day equal to 86,400 seconds, but it remains an inertial frame of reference, and when astronomically measured (by star transit, or whatever) is initially sidereal.