Greenwich Mean Time

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, Lunnon. GMT wis umwhile uised as the internaitional ceevil time staundart, nou supersedit in that function bi Coordinated Universal Time (UTC). The day GMT is conseedert equivalent tae UTC for UK ceevil purposes (but this isna formalised) an for navigation is conseedert equivalent tae UT1 (the modren form o mean solar time at 0° longitude); thir twa meanins can differ bi up tae 0.9 s. Consequently, the term GMT should nae be used for precise purposes.[1]


  1. Hilton and McCarthy 2013, p. 231–2)