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Bouguer, Pierre

(Encyclopedia) Bouguer, PierreBouguer, Pierrepyĕr b&oomacr;gĕrˈ [key], 1698–1758, French mathematician and hydrographer. He made some of the first photometric measurements, calculating the…

Halley, Edmond

(Encyclopedia) Halley, EdmondHalley, Edmondhălˈē, hôˈlē [key], 1656–1742, English astronomer and mathematician. He is particularly noted as the first astronomer to predict the return of a comet and…

Eris, in astronomy

(Encyclopedia) Eris, in astronomy, the largest known dwarf planet. Eris, whose highly eccentric elliptical orbit ranges from 38 AU to 97 AU and is inclined more than 44°, is the largest known object…

Sun, Moon, and Stars: April 2000

Movement of the heavenly bodies: April, 2000   April Calendar Day Phenomenon Hour (UT) Hour (EST) 2 Mercury is 1 degree 6 minutes north of the Moon. 1200 7 am 3…

Sun, Moon, and Stars: April 2001

Movement of the heavenly bodies: April 2001   April Calendar Moon Phase Day Phenomenon Hour (UT) Hour (EST) 1 FIRST QUARTER 1100 6 am 5 The Moon is at…

Sun, Moon, and Stars: August 2000

Movement of the heavenly bodies: August 2000   August Calendar Moon Phase Day Phenomenon Hour (UT) Hour (EST) 2 Pallas, the second-largest asteroid, is 0 degrees 0…

Sun, Moon, and Stars: August 2001

Movement of the heavenly bodies: August 2001   August Calendar Moon Phase Day Phenomenon Hour (UT) Hour (EST) 3 Neptune is 3 degrees north of the Moon. 1900 3…

Sun, Moon, and Stars: December 2000

Movement of the heavenly bodies: December 2000   December Calendar Moon Phase Day Phenomenon Hour (UT) Hour (EST) 1 The Moon is at its apogee, or farthest point from…