Author: Öpik, Ernst Julius [1893-1985]
Title: Photometric Measures on the Moon and the Earth-shine [together with 8 other publications, ca. 1924-1943]
Description: Tartu [Estonia], 1924-1943. orig. wrappers. 24x16cm, NINE ITEMS.. Unopened. Some wear. Good. ¶ This is a collection of nine papers, all authored or co-authored by Öpik between 1924-1943, all published at Tartu in the series "Publications de l'Observatoire Astronomique de l'Université de Tartu". Includes: 1) " Photometric Measures on the Moon and the Earth-shine" [1924, 68pp]; 2) " Determination of Colour-Equivalents of Stars According to Tikhoff's Method..." [1925, 32pp]; 3) "Measures of Double Stars (1924- 1926)" [1927, 55pp] ; 4) "Stellar Distribution and the Law of Chance: Second Paper" [1934, 28 pp; a tear to cover]; 5) "Telescopic Observations of Meteors at the Tartu Observatory" [1930, 16pp]; 6) "Stellar Distribution and the Law of Chance: Third Paper" [1934, 20pp]; 7) "Determination of Colour-Equivalents of Stars According to Tikhoff's Method : Second Paper" [1935, 26pp]; "The Densities of Visual Binary Stars" [1935, 16pp]; "Zusammengesetzte Sternmodelle, II" [1943, 51pp]. ["Öpik was an Estonian astronomer and astrophysicist ...In 1922, Öpik published a paper in which he estimated the distance of the Andromeda Galaxy. He determined the distance using a novel astrophysical method based on the observed rotational velocities of the galaxy...His method is still widely used....In 1922 he correctly predicted the frequency of craters on Mars long before they were detected by space probes. In 1932 he postulated a theory concerning the origins of comets in our solar system. He believed that they originated in a cloud orbiting far beyond the orbit of Pluto. This cloud is now known as the Oort cloud or alternatively the Öpik-Oort Cloud ... - wikipedia].

Keywords: Astrophysics, Astronomy, Stellar Physics, , , , , ,