Time Standard Time standards based on Earth rotation
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- Historically, time standards were often based on the Earth's rotational period. From the late 18 century to the 19th century it was assumed that the Earth's daily...
celestial objects in the night sky. Sidereal time is a "time scale that is based on Earth's rate of rotation measured relative to the fixed stars". Viewed...- Universal Time (UT or UT1) is a time standard based on Earth's rotation. While originally it was mean solar time at 0° longitude, precise measurements...
UTC as the standard of all Australian standard times, thereby eliminating the effects of slight variations in the rate of rotation of the Earth that are...
distances based on observations at Greenwich, led to GMT being used worldwide as a standard time independent of location. Most time zones were based upon GMT...- The International Earth Rotation and Reference Systems Service (IERS), formerly the International Earth Rotation Service, is the body responsible for maintaining...
and timekeeping, other standards such as UT1 and International Atomic Time (TAI) are also used alongside UTC. UTC is based on TAI, which is a weighted...
millennium. Moon-based: the month was based on the Moon's orbital period around the Earth. Earth-based: the time it took for the Earth to rotate on its own axis...- the Earth. It is a constant defined by standard as 9.80665 m/s2 (about 32.17405 ft/s2). This value was established by the 3rd General Conference on Weights...
- means of specifying days, inherited from non-uniform time standards based on the rotation of Earth. Specifically, both Julian Dates and the Gregorian calendar...
- mean solar time scale, and to replace for these purposes Universal Time (UT) and any other time scale based on the rotation of the Earth around its axis...
rotation period. Traditionally, there are three types of time reckoning based on astronomical observations: apparent solar time and mean solar time (discussed...- of specifying days, carried over from non-uniform time standards based on the rotation of the Earth. Specifically, both Julian days and the Gregorian...
- time variations in the Earth's rotation by the addition or deletion of seconds (called leap seconds). The Time Act 1974 defines New Zealand Standard Time...
- specifying days, carried over from non-uniform time standards based on the rotation of the Earth. Specifically, both Julian Dates and the Gregorian calendar...
of GMT (based directly on the Earth's rotation) was used instead of an atomic timescale.[citation needed] The precise definition of Unix time as an encoding...- which is the time for a fixed feature on the Sun to rotate to the same apparent position as viewed from Earth (the Earth's orbital rotation is in the same...
- planetary ephemerides were calculated using time scales based on the Earth's rotation: usually the mean solar time of one of the principal observatories, such...
- Islands, effective at 1 January 1894. This linked the standard time in Denmark to Earth's rotation, and clocks in Denmark were at 12:00, when the sun is...
Second (redirect from Second (time))feasible to define the second based on fundamental properties of nature with caesium clocks. Because the speed of Earth's rotation varies and is slowing ever...
- 1877 (1877) On the Distribution of Standard Time in the United States by Edward Singleton Holden 613737Popular Science Monthly Volume 11 June 1877 — On the Distribution
- Spacetime (redirect from Space-time continuum)a space-time representation a passage from one Galilean frame to another is given by a rotation of our four-dimensional Cartesian space-time mesh-system
- period of the object; that is, the rotation with respect to some fixed background. Thus the rotation period for the Earth would be 23.93 rather than 24 hours