Geophysics Earth rotation and tides Concept
Length of day variations
Summary
Length of day variations are the changes in the time the Earth takes to complete one rotation, compared with the nominal SI seconds. They are a few milliseconds in size. They come from exchanges of angular momentum with the atmosphere, oceans and core, from tides, and from changes in the moment of inertia. Tidal friction makes the day longer on average over centuries, while seasonal winds change it by about a millisecond within a year.
Further reading
About this page
| Tag | BC5JSSJSEW |
|---|---|
| URI | m2://BC5JSSJSEW |
| Kind | concept |
| Writing | W0 stub |
| MSC | 86A30, 86A04 |
| Same as | |
| Changed | 3 November 2026 |
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