‎SPENCER JONES (H.)‎
‎General astronomy -- EDITION ORIGINALE‎

‎London, Arnold, 1922, un volume in 8 relié en pleine toile éditeur, (4), 392pp., figures dans le texte, 24 planches‎

Reference : 4862

‎---- EDITION ORIGINALE ---- "Spencer Jones's scientific interests were connected mainly with the tasks of the observatories with which he was associated : primarily the problems of positional and fundamental astronomy. His outstanding personal contributions were a study of the speed of rotation of the earth, and one of the solar parallax... He proved that the fluctuations in the observed longitudes of the celestial bodies can be attributed not to any peculiarities of their motions but, rather, to fluctuations in the angular velocity of rotation of the earth. He devoted several years to a new determination of the mean distance of the earth from the sun through measurements of the parallactic displacement of the asteroid Eros during its favorable opposition in 1930-1931... All considered, Spencer Jones's principal original contributions suffered - as did those of many others - from the fact that they were concerned with problems eminently suitable for treatment by automatic computing machinery, but were carried out ten years or so before its advent". (DSB XII pp. 573/574) ---- The celestial sphere - The earth - The earth in relation to the sun - Eclipses and occulations - Astronomical instruments - The planetary motions - Comets and meteors - The stars - The stellar universe - etc**4862/M5DE‎