astronomical constant造句

• It includes a listing of astronomical constants and the sine table.
• An "'astronomical constant "'is a physical constant used in astronomy.
• He accurately calculated many astronomical constants, such as the periods of the planets, times of the solar and lunar eclipses, and the instantaneous motion of the Moon.
• His own original research necessarily took a lower profile but he continued to publish on relativity, astronomical constants and time measurement, as well as collaborating on two text books.
• The following year he succeeded the Rev . Robert Main as chief assistant at the Royal Greenwich Observatory, and at once undertook the fundamental task of improving astronomical constants.
• "' Section K : TABLES AND DATA "'includes Julian dates, selected astronomical constants, relations between time scales, coordinates of the celestial pole, reduction of terrestrial coordinates, interpolations methods, vectors and matrices.
• Before 1984, the tropical year ( not the Julian year ) and a measured ( not defined ) speed of light were included in the IAU ( 1964 ) System of Astronomical Constants, used from 1968 to 1983.
• Life As We Know It seems to depend on the miraculous and improbable juggling of the numerical values of a few atomic and astronomical constants-- like the relative masses of elementary particles or the strength of the " dark energy " accelerating the universe outward.
• It is named for American astronomer Gerald Maurice Clemence ( 1908 1974 ), first scientific director of the United States Naval Observatory and professor of astronomy at the Yale Observatory, known for his work on the theory of the motion of Mars and Mercury, on the system of astronomical constants, and other research in celestial mechanics.
• A new set of " current best estimates " for various astronomical constants was approved the 27th General Assembly of the International Astronomical Union ( IAU ) in August 2009 . It includes masses for all the planets except the Earth Moon system, as well as Pallas : values for the masses of Eris, Pluto, Ceres, Vesta and Pallas are as given in the table above.