Page 24 - Reference Systems Service News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Wed, 06 Jan 2021 13:57 UTC © Stocktrek Images via Getty ImagesMany of us wish we could get through this difficult year as quickly as possible. Seems the Earth feels the same way it has been spinning unusually fast lately. 2020 included the 28 shortest days since 1960. Atomic Clocks Expose Earth s Irregular Speed The Earth is an excellent timekeeper: on average, with respect to the Sun, it rotates once every 86,400 seconds, which equals 24 hours, or one mean solar day. But it is not perfect. When highly accurate atomic clocks were developed in the 1960s, they showed that the length of a mean solar day can vary by milliseconds (1 millisecond equals 0.001 seconds). These differences are obtained by measuring the Earth s rotation with respect to distant astronomical objects, and using a mathematical formula to calculate the mean solar day.

Reference systems serviceInternational atomic timeInternational earth rotationStocktrek imagesShortest daysDay lengthUniversal timeகுறிப்பு அமைப்புகள் சேவைசர்வதேச அணு நேரம்சர்வதேச பூமி சுழற்சிநாள் நீளம்உலகளாவிய நேரம்