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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: Rayleigh criterion
Radiotelescopes
Radiotelescopes detect radio waves, produced for example from the interactions of charged particles with magnetic fields. Radio waves interact with matter in a different way than visible light, so radiotelescopes are different from optical telescopes. The strength of a radio source … Continue reading
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Tagged antenna pattern, Arecibo observatory, array, bandwidth, FAST observatory, halfpower beam width, HPBW, Jansky, power, radiotelescope, Rayleigh criterion, resolution, spectral flux density, Square Kilometre Array, telescope array, Very Large Array, Very Long Baseline Array
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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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