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Open AccessArticle

Simultaneity and Precise Time in Rotation

Defence Science and Technology Group, CEWD 205 Labs, P.O. Box 1500, Edinburgh SA 5111, Australia
Universe 2019, 5(12), 226; https://doi.org/10.3390/universe5120226
Received: 4 October 2019 / Revised: 11 November 2019 / Accepted: 12 November 2019 / Published: 16 December 2019
(This article belongs to the Special Issue Rotation Effects in Relativity)
I analyse the role of simultaneity in relativistic rotation by building incrementally on its role in simpler scenarios. Historically, rotation has been analysed in 1 + 1 dimensions; but my stance is that a 2 + 1 -dimensional treatment is necessary. This treatment requires a discussion of what constitutes a frame, how coordinate choices differ from frame choices, and how poor coordinates can be misleading. I determine how precisely we are able to define a meaningful time coordinate on a gravity-free rotating Earth, and discuss complications due to gravity on our real Earth. I end with a critique of several statements made in relativistic precision-timing literature, that I maintain contradict the tenets of relativity. Those statements tend to be made in the context of satellite-based navigation; but they are independent of that technology, and hence are not validated by its success. I suggest that if relativistic precision-timing adheres to such analyses, our civilian timing is likely to suffer in the near future as clocks become ever more precise. View Full-Text
Keywords: rotating disk; clock synchronisation; precise timing; Sagnac effect; accelerated frame; circular twin paradox; Selleri’s paradox rotating disk; clock synchronisation; precise timing; Sagnac effect; accelerated frame; circular twin paradox; Selleri’s paradox
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MDPI and ACS Style

Koks, D. Simultaneity and Precise Time in Rotation. Universe 2019, 5, 226. https://doi.org/10.3390/universe5120226

AMA Style

Koks D. Simultaneity and Precise Time in Rotation. Universe. 2019; 5(12):226. https://doi.org/10.3390/universe5120226

Chicago/Turabian Style

Koks, Don. 2019. "Simultaneity and Precise Time in Rotation" Universe 5, no. 12: 226. https://doi.org/10.3390/universe5120226

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