What is astrometry?

Question

What is astrometry?

BlackTom AI · Accepted Answer

The question asks: What is astrometry?
Since the answer options are not provided, we will focus on defining astrometry and why the given answer aligns with the standard definition.
Astrometry is a branch of astronomy that centers on measuring the precise positions and movements of celestial objects in the sky. This includes pinpointing exact coordinates of stars, planets, and other bodies, tracking their motions over time (proper motion), and determining distances via parallax.
The core goal of astrometry is to establish accurate celestial reference frames and to quantify how objects change position relative to those frames. This contrasts with other astronomical disciplines that focus on other properties, such as photometry (brightness) or spectroscopy (composition and motion from spectral lines).
If options were present, the correct choice would directly describe the precise positional measurements of objects on the sky, possibly mentioning parallax, proper motion, or celestial coordinates. Any option that emphasizes measurements unrelated to sky positions (for example, only brightness or spectral characteristics) would be incorrect.
In summary, astrometry is fundamentally about recording and analyzing where objects are in the sky and how those positions change over time.

COS SPR 25 class 2 Feb 25 Ch 13: Other Planetary Systems

What is astrometry?

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