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Max Planck Encyclopedia of Public International Law [MPEPIL]

Time, International Regulation of

Andreas Witte

From: Oxford Public International Law (http://opil.ouplaw.com). (c) Oxford University Press, 2015. All Rights Reserved.date: 02 July 2020

History of international law — NGOs (Non-Governmental Organizations) — Treaties, interpretation

Published under the auspices of the Max Planck Foundation for International Peace and the Rule of Law under the direction of Rüdiger Wolfrum.

1 The most intuitively self-suggesting unit of time is the apparent solar day. Its duration is defined as the interval between two noons, with noon being the moment when the Sun stands on the observer’s meridian of longitude (meridian transit). For astronomical reasons, the duration of the apparent solar day varies within a range of fifty seconds. These fluctuations balance out over the course of one year at an average of 24 hours, leading to the concepts of mean solar day and mean solar time, which are based on the average rather than actual durations of apparent...
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