Word origin · etymology
Modern scientific compound.
Astrometry joins Greek astro-, star, with -metry, measurement; astrometric is its adjective, applied here to a corrected positional convention.
How we know · epistemology
Observational model
Light-travel correction produces an astrometric direction before additional apparent-position corrections. Mixing these two stages can look like a calculation error even when each implementation follows its stated convention.
Connected concepts
Browse other concepts in Astronomy & coordinates →
These links connect subjects and terminology. They do not establish a shared historical origin.
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.