Herman Zanstra

	Herman Zanstra Herman Zanstra (November 3, 1894, Schoterland – October 2, 1972, Haarlem) was a Dutch astronomer. Zanstra was born near Heerenveen in Friesland. In 1917 he graduated with an Engineer's degree in chemical engineering from the Delft Institute of Technology. While working in Delft for four years, the last two as a high school teacher, he wrote a highly theoretical and mathematical paper on relative motion which he sent to William Francis Gray Swann. Swann, then offered him to earn a Ph.D. degree in theoretical physics with him at the University of Minnesota at Minneapolis, which he did in two years time by expanding on his paper (dissertation: ''A Study of Relative Motion in Connection with Classical Mechanics'', 1923). After another year with Swann, now in Chicago, and a year at various labs in the Netherlands and Germany and two months at Niels Bohr's lab in Copenhagen, he became a postdoc at Caltech. Here he wrote a famous paper, ''An Application of the Quantum Theory to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Caltech The California Institute of Technology (branded as Caltech or CIT)The university itself only spells its short form as "Caltech"; the institution considers other spellings such a"Cal Tech" and "CalTech" incorrect. The institute is also occasionally referred to as "CIT", most notably in its alma mater, but this is uncommon. is a private university, private research university in Pasadena, California. Caltech is ranked among the best and most selective academic institutions in the world, and with an enrollment of approximately 2400 students (acceptance rate of only 5.7%), it is one of the world's most selective universities. The university is known for its strength in science and engineering, and is among a small group of Institute of Technology (United States), institutes of technology in the United States which is primarily devoted to the instruction of pure and applied sciences. The institution was founded as a preparatory and vocational school by Amos G. Throop in 1891 and began ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	2945 Zanstra Year 945 (Roman numerals, CMXLV) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. Events By place Byzantine Empire * January 27 – The co-emperors Stephen Lekapenos, Stephen and Constantine Lekapenos, Constantine are overthrown barely a month after deposing their father, Romanos I Lekapenos, Romanos I. With the help of his wife, Constantine VII becomes sole emperor of the Byzantine Empire. He appoints to the highest army commands four members of the Phokas (Byzantine family), Phokas family, which have been in disgrace under Romanos. * Constantine VII concludes a Rus'–Byzantine Treaty (945), Rus'–Byzantine treaty in which Rus' merchants are to conduct their trade in Constantinople. While many Rus' make their fortunes in trade with the Arab Muslims, the Rurik dynasty, Rurik Dynasty of Kiev grows rich from Byzantine commerce. Europe * Spring – Berengar II of Italy, Berengar of Ivrea invades Italy with hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]