The spinning motion of a star around its axis, measurable through the Doppler broadening of spectral lines or by observing surface features. Stellar rotation affects magnetic field generation, stellar winds, and evolutionary processes.
From Latin 'stella' for star and 'rotatio' meaning a turning around. The concept became observable in the early 20th century when spectroscopy revealed that stellar rotation causes characteristic broadening of absorption lines in stellar spectra.
Stellar rotation is like a cosmic dance that never stops! Our Sun rotates once every 25 days at its equator, but some young stars spin so fast they complete a rotation in just hours, flinging material into space like a cosmic merry-go-round.
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