Galileo Observed the Phenomenon of Solar Rotation in the Early

question 166

Multiple Choice

Galileo observed the phenomenon of solar rotation in the early 1600s by

• A) noting the periodic (monthly) variation of auroral disturbances, or northern lights.
• B) watching bright regions of hydrogen gas drift across the Sun.
• C) measuring the motion of sunspots across the solar surface.
• D) measuring the Doppler shift of hydrogen spectral lines from the east and west limbs of the Sun.

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