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...ellite navigation)|Galileo Programme]] and the United States' [[GPS]]. The timekeeping [[Accuracy and precision|accuracy]] of the involved atomic clocks is import ..., which defines the [[Second#History of definition|mean solar second]] for timekeeping.<ref>{{Cite web |date=14 June 2022 |title=Milestones:First Atomic Clock, 19 ...

[[File:Acute Triangle.svg|thumb|upright|A triangle labelled with the components of the law of sines. Capital {{math|''A''}}, {{math|''B''}} and {{math|''C' ...many questions in previous Greek mathematical astronomy, especially their timekeeping.<ref name=Gingerich1986 /> ...