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歳差運動 (さいさうんどう) Japanese meaning | Kotomora

歳さい差さ運うん動どう

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Meanings

1

noun

precession of the equinoxes

astronomy

Astronomical term for the slow conical motion of Earth's axis, causing the equinoxes to shift over time.

See also: 歳差 (さいさ)

歳さい差さ運うん動どうの周しゅう期きは約やく2万まん6000年ねんです。
The period of the precession of the equinoxes is about 26,000 years.

2

noun

precession

physics

Physics term for the change in orientation of a rotating body's axis; used for gyroscopes, spinning tops, etc.

コマの歳さい差さ運うん動どうを観かん察さつする。
Observe the precession of a spinning top.

Kanji

歳year-end, age, occasion
差distinction, difference, variation
運carry, luck, destiny
動move, motion, change

Similar words

歳さい差さ
歳差 is a shorter form meaning 'precession' or 'equinoctial precession', often used in compounds. 歳差運動 explicitly adds 'motion' and is more common for the physical phenomenon.

Etymology

Compound of 歳差 (さいさ, 'precession') and 運動 (うんどう, 'motion'). The exact derivation of 歳差 is uncertain, but it is a technical term used in astronomy and physics.