positional astronomy
Mapping the heavens
Positional astronomy is the branch of astronomy concerned with measuring and calculating the precise locations of celestial objects in the sky.
It deals with coordinate systems, the apparent motions of stars and planets, and corrections for effects like atmospheric refraction and Earth's wobble.
The field underpins navigation, timekeeping, and the compilation of star catalogs.
- Ptolemaic systemEarth as universe's center
- optical telescopeDevice magnifying through lenses
- sextantMaritime angular measurement device
- astrolabeAncient altitude-measuring instrument
- quadrantFourth of a circle
precession · nutation · true north · celestial sphere · ephemeris · star chart · fixed stars · declination · maritime navigation · lunar calendars · nadir · equator · meridian · observatory · transit · parallax · zenith · zodiac constellations
- geodesytriangulation, leveling, benchmarks, control points, survey markers
positional astronomyastrophysics
Physics of celestial bodies
cosmology · spectroscopy · photometry · astrobiology · planetary science