The Irish Astronomical Journal, Volume 7Irish Astronomical Society, 1965 - Astronomy |
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absorption altitude angular Armagh Observatory asteroids Astron atmosphere average belt Binary Star Boyden Observatory breakup brightness centre charts clusters collisions coma cometary comets compass component corrector plate cosmic craters density diameter distance Dublin Dunsink Dunsink Observatory E. J. Öpik earth electrons emission energy estimated flare stars fragments galactic galaxies Gore heliocentric instrument interplanetary ionization ions Ireland Irish Astronomical Journal km/sec latitude light longitude lunar magnetic field magnitude Mariner Mars Martian meteorites meteors MgII million moon motion navigation Nebula northern nucleus objects observations optical orbit original Patrick Moore perihelion period photographic planets possible present quasars radial velocities radiation radio sources radius ratio reflector refractor region rotation Royal satellite solar hemisphere solar system solar wind space spectral spectral type spectrum stellar sun-grazing sunspot surface Table telescope temperature theory tidal universe Variable Stars variation velocity Venus William Rowan Hamilton X-ray