Lunam 2000 (Lunar Atmosphere Mission)

Barbieri, C.; Fornasier, S.; Lazzarin, M.; Marchi, S.; Rampazzi, Francesca; Verani, S.; Cremonese, Gabriele; Ragazzoni, Roberto; Dolci, M.; Benn, Chris; Mendillo, M.; Baumgardner, J.; Chakrabarti, Supriya; Wilson, J. K.

doi:10.1007/978-94-010-0800-6_43

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(3 citation statements)

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“…One good reason was perhaps that the smallest time interval reckoned by the time-keeping devices of the moment (the resolution) was below such a small quantity. The first mechanical clocks that blossomed in Europe at the end of the 13th century 3 , first with a verge-foliot mechanism as a regulator and later with a pendulum, had a daily rate of about a quarter of an hour, and the marks depicted on the dials were, at most, the hours.…”

Section: Definitions Of the Second As The Si Unit Of Time Intervalmentioning

confidence: 99%

“…53 (3). 15 Leschiutta S and Tavella P: Reckoning Time, Longitude and the History of the Earth's rotation using the moon, pp 225-36 in [3]. 16 Oberti E 1932 Amerigo Vespucci, Paravia, Torino.…”

Section: The Clocks Used In the Observatories Laboratories And Transm...mentioning

confidence: 99%

“…Coherent synthesis will be dealt with in section 4 3. The first written citation seems to be from Galvano della Fiamma, a monk in Milano, saying that in 1309, in his church, San Eustorgio, was installed a 'horologium ferreum'; in the following years there were dozens of quotations in European languages.…”

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confidence: 99%

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The definition of the ‘atomic’ second

Leschiutta

2005

Metrologia

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When the reference of a unit is changed, the task remains of expressing the new definition in the terms of the previous one. In two centuries, for instance, the definition of the metre was changed six times. Around 1955, the definitions of the second as the SI unit of time were changed from astronomical ones, based on the rotation (or revolution) of the Earth, to a definition stemming from a quantum phenomenon. The expression of the new atomic second in terms of the previous definitions required a number of actions and measurements. The aim of this paper is to review these actions, some of which, fifty years later, are being forgotten for a lack of adequate documentation.

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Section: Definitions Of the Second As The Si Unit Of Time Intervalmentioning

confidence: 99%