The Role of Time in Navigation

Stratton, A.

doi:10.1017/s037346330003928x

Cited by 1 publication

(1 citation statement)

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“…Time is so much a part of daily experience that no thought is ordinarily given to its meaning; nevertheless, the scientific measurement of time interval requires the definition of a standard unit of measurement that is reasonably invariant to human experience [1]. Apparent celestial motions have been exalted through history as a preferred mode of reckoning time, evidenced by calendars based on recurring celestial phenomena and the fact that civil time of day has been based on solar time in one form or another since antiquity.…”

Section: Introductionmentioning

confidence: 99%

Time scales, their users, and leap seconds

Seidelmann

Seago²

2011

Metrologia

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Numerous time scales exist to address specific user requirements. Accurate dynamical time scales (barycentric, geocentric and terrestrial) have been developed based on the theory of relativity. A family of time scales has been developed based on the rotation of the Earth that includes Universal Time (specifically UT1), which serves as the traditional astronomical basis of civil time. International Atomic Time (TAI) is also maintained as a fundamental time scale based on the output of atomic frequency standards. Coordinated Universal Time (UTC) is an atomic scale for worldwide civil timekeeping, referenced to TAI, but with epoch adjustments via so-called leap seconds to remain within one second of UT1. A review of the development of the time scales, the status of the leap-second issue, and user considerations and perspectives are discussed. A description of some more recent applications for time usage is included.

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Section: Introductionmentioning

confidence: 99%