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Topics related to "Moon, snow played fateful role in Boston Massacre Astronomer's calculations"

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Douglas Rayner Hartree Douglas Rayner Hartree
HARTREE, DOUGLAS RAYNER(b. Cambridge, England, 27 March 1897, d. 12 February 1958),mathematics, theoretical physics, quantum chemistry, computing, numerical analysis.Hartree played a fundamental role in the field of twentieth-century numerical analysis and its application to theoretical physics. He... Read more
ephemeris time ephemeris time
ephemeris time (ET), astronomical time defined by the orbital motions of the earth, moon, and planets. The earth does not rotate with uniform speed, so the solar day is an imprecise unit of time. Ephemeris time is calculated from the positions of the sun and moon relative to the earth, assuming... Read more
Gerhard Herzberg Gerhard Herzberg
HERZBERG, GERHARD(b. Hamburg, Germany, 25 December 1904; d. Ottawa, Ontario, Canada, 3 March 1999), spectroscopy, chemistry, physics, astrophysics.Herzberg was a seminal and prolific spectroscopist active for over sixty years in Germany, the United States, and most importantly, in Canada. His career... Read more
John Couch Adams John Couch Adams
John Couch Adams 1819-92, English astronomer, grad. St. John's College, Cambridge, 1843. By mathematical calculation based on irregularities in the motion of Uranus, he predicted the position of the then unknown planet Neptune. Because of delay in England in making a telescopic search for the... Read more
Grace Hopper Grace Hopper
Grace Hopper With the longest active military career, Rear Admiral Grace Hopper (1906-1992) was also known as "Amazing Grace" and "Grand Old Lady of Software." She played an instrumental role in the development of the COBOL computer programming language. Grace Hopper, who rose through Navy... Read more
Hipparchus (astronomer) Hipparchus (astronomer)
Hipparchus fl. 2d cent. BC, Greek astronomer, b. Nicaea, Bithynia. He is the first systematic astronomer of whom there are records. He made his observations chiefly on the island of Rhodes. Ptolemy's geocentric theory of the universe was based largely on the conclusions of Hipparchus, a record of... Read more
Edmond Halley Edmond Halley
Edmond Halley , 1656-1742, English astronomer and mathematician. He is particularly noted as the first astronomer to predict the return of a comet and the first to point out the use of a transit of Venus in determining the parallax of the sun. In 1676 he went to St. Helena to observe the southern... Read more
Aristarchus of Samos Aristarchus of Samos
Aristarchus of Samos , fl. c.310 BC-c.230 BC, Greek astronomer and mathematician of the Alexandrian school. He is said to have been the first to propose a heliocentric or sun-centered theory of the universe. Of his writings only a treatise, The Sizes and Distances of the Sun and Moon, remains. The... Read more
Johann Franz Encke Johann Franz Encke
Johann Franz Encke , 1791-1865, German astronomer. He was assistant (1816-22) and director (1822-25) of the observatory at Seeberg (near Gotha) and director (from 1825) of the Berlin Observatory. He is known for his study of records of the orbit of the comet of 1680, for calculations—based on... Read more

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