NASA Technical TranslationNational Aeronautics and Space Administration, 1959 - Aeronautics |
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acute angles apparent position assume assumption axis of rotation become bright center of gravity comet exhibited comet's center comet's orbit comet's sphere compared cone of light consider considerably curvature curved Decl density determine deviation direction distance earth emanating cone emanating matter emanating particles equation explained expression fixed star foreshortening formula in Section g sin G greater Halley's Comet Heinsius heliometer hypothesis latter left the comet's libration located luminous matter appeared magnification magnitude margin move NATURE OF HALLEY'S nebulosity normal attractive force nucleus observation on October obtain Octbr October 12 Olbers opposite oscillating motion particles emanated perihelion perpendicular phenomena plane polar force pole of rotation portion positional angle possess product g quantity radius vector refraction relative repulsive force right ascension right side Section 12 smaller solar mass sphere of influence sun side tail particles tails of comets Taylor's theorem tion velocity visible emanation yield