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 altitude archaeoastronomy Astronomy azimuth azimuthangle coordinate system binding energy brightness celestial equator classical mechanics collapse conjunction coordinate system Copernicus crosssection declination deferent ecliptic elongation epicycle equatorial coordinate system equinox escape velocity formulae Galileo geocentric gravitational constant gravitational potential energy gravity greek astronomy Heisenberg uncertainty principle heliocentric Hipparcus HUP hydrostatic equilibrium Isaac Newton KelvinHelmholtz timescale Kepler Kepler's Laws kinetic energy luminosity MaxwellBoltzmann distribution mechanical energy meridian mometum Nebra skydisk neutrino Newton's laws opacity opposition Planck's constant Plato position precession proper motion Ptolemy pyramids Pythagoras radial velocity radiation pressure Rayleigh criterion resolution right ascension sidereal period sidereal time skydisk solar time solstice standard deviation stonehenge synodic period tangential velocity transverse velocity Tycho Brahe Virial theorem zenith

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Tag Archives: opacity
Energy Transport
Energy transport inside a star takes place in three ways: Radiation: dependent on opacity, flux, density, and temperature. Larger opacity and flux involve steeper decrease in T with increasing r. Convection: cool masses move “down” (in the direction of gravitational pull) and hot masses … Continue reading
Stellar Atmospheres
Radiation emitted by a star: Can be measured in terms of the specific intensity. It corresponds to the amount of energy of a given wavelength per unit time dt crossing a unit area dA into a solid angle dΩ (think of … Continue reading