Astrometry is the very precise measurement of:
A)a star's brightness (e.g., to measure light variations).
B)a star's blackbody curve (e.g., to measure the star's temperature).
C)a star's position in the sky (e.g., to measure its motion).
D)lines in a star's spectrum (e.g., to measure the Doppler shift).

Question

Quizplus · Accepted Answer

Astrometry is the precise measurement of a star's position in the sky, including its motion. This can be used to study movements of stars within our galaxy or to identify exoplanets by detecting their gravitational effect on their parent star's motion.

Astrometry Is the Very Precise Measurement Of