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List Of Common Astronomy Symbols
This is a compilation of symbols commonly used in astronomy, particularly professional astronomy. Age (stellar) * τ - age Astrometry parameters Astrometry parameters * Rv - radial velocity * cz - apparent radial velocity * z - Redshift * μ - proper motion * π - parallax * J - epoch * α - Right Ascension * δ - Declination * λ - Ecliptic longitude * β - Ecliptic latitude * l - Galactic longitude * b - Galactic latitude Cosmological parameters Cosmological parameters * h - dimensionless Hubble parameter * H0 - Hubble constant * Λ - cosmological constant * Ω - density parameter * ρ - density * ρc - critical density * z - redshift Distance description Distance description for orbital and non-orbital parameters: * d - distance ** d - in km = kilometer ** d - inhttps://academia.stackexchange.com/a/29113 mi = mile ** d - in AU = astronomical unit ** d - in ly = light-year ** d - in pc = parsec ** d - in kpc = kiloparsec (1000 pc) * DL - luminosity distance, ''obtaining an obj ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomy
Astronomy () is a natural science that studies astronomical object, celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and chronology of the Universe, evolution. Objects of interest include planets, natural satellite, moons, stars, nebulae, galaxy, galaxies, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, astronomy studies everything that originates beyond atmosphere of Earth, Earth's atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole. Astronomy is one of the oldest natural sciences. The early civilizations in recorded history made methodical observations of the night sky. These include the Babylonian astronomy, Babylonians, Greek astronomy, Greeks, Indian astronomy, Indians, Egyptian astronomy, Egyptians, Chinese astronomy, Chinese, Maya civilization, Maya, and many anc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
