The Observatory, Volume 56Editors of the Observatory, 1933 Some vols. for 1886- include a special issue: Annual companion to the Observatory. |
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Page 159
... distance of the Sun , as follows : - After Eratosthenes had determined the size of the Earth by measuring an arc of the meridian in Egypt , a good estimate was made of the distance of the Moon ; one method was based on measuring the ...
... distance of the Sun , as follows : - After Eratosthenes had determined the size of the Earth by measuring an arc of the meridian in Egypt , a good estimate was made of the distance of the Moon ; one method was based on measuring the ...
Page 160
by about 89 ° 40 ' ; this gave a distance of the Sun about half its true value . Another estimate was made by conjecturing that the Earth was midway between its neighbours Venus and Mars in size . This gave too great a distance . Then ...
by about 89 ° 40 ' ; this gave a distance of the Sun about half its true value . Another estimate was made by conjecturing that the Earth was midway between its neighbours Venus and Mars in size . This gave too great a distance . Then ...
Page 331
... distance ( the value obtained at Victoria being 17 km./sec . ) with a direction to the centre in galactic longitude 324 ° , agreeing with the latest Victoria determination from stellar radial velocities of 324 ° • 4 • As these Mt ...
... distance ( the value obtained at Victoria being 17 km./sec . ) with a direction to the centre in galactic longitude 324 ° , agreeing with the latest Victoria determination from stellar radial velocities of 324 ° • 4 • As these Mt ...
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absorption appears astrographic Astronomer Royal atmosphere atom bands bright BRITISH ASTRONOMICAL ASSOCIATION calcium Cambridge Cape catalogue central intensities centre chromosphere clock colour comet comparison stars computed correction corresponding craters Crommelin curve Decl density determined discussion distance double stars Earth eclipse effect electrons emission ephemeris equation equatorial Eros frequency galaxies George Darwin give given Greaves Greenwich hydrogen instrument interest investigation ionisation Jupiter km./sec latitude layer light lines longitude magnetic magnitude mean measured meridian meteorite meteors method motion nebulæ observations Observatory obtained orbit oscillator paper period photographs planet planetary plates position possible present President probable error Prof Professor Quadrantids radial velocities radiation Right Ascension rotational speed Sir Arthur Eddington Sir Frank Dyson slide Solar Activity spectra spectrograph spectrum spot Steavenson stellar Sun's sunspot surface tables telescope temperature theory University variable variable stars variation wave-length zero