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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: brightness
Quality of seeing
Resolution: There is a problem of interference given the wave nature of light. It is analogous to the interference pattern caused by a single slit. f = focal length D = width of the slit m = positive integer. 1, … Continue reading
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Tagged aberration, airy disk, astigmatism, Astronomy, brightness, chromatic aberration, coma, curvature of field, distortion of field, focal length, focal ratio, focallength, focus, illumination, intensity, interference, Optics, plate scale, Rayleigh criterion, resolution, single slit, spherical aberration, twink
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Magnitude
Apparent magnitude (m): Apparent “brightness” of a star, as seen from Earth. Hipparcus first measured it, using a scale from 1 (brightest) to 6 (dimmest). Note that smaller values correspond to brighter starts! This scale was adopted and extended in … Continue reading