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ephemeris time

(Encyclopedia)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. Ephe...

Dirac, Paul Adrien Maurice

(Encyclopedia)Dirac, Paul Adrien Maurice dĭrăkˈ [key], 1902–84, English physicist. He was educated at the Univ. of Bristol and St. John's College, Cambridge, and became professor of mathematics at Cambridge in...

Breviary of Alaric

(Encyclopedia)Breviary of Alaric ăˈlərĭk [key], Visigothic code of Roman law issued (506) by King Alaric II for his Roman subjects in Spain and S Gaul. It is also known as the Lex Romana Visigothorum. Based lar...

Æthelbert, king of Kent

(Encyclopedia)Æthelbert ĕˈthəlbərt, ă– [key], d. 616, king of Kent (560?–616). Although defeated by the West Saxons in 568, he became the strongest ruler in England S of the Humber River. His wife, Bertha...

James II, king of England, Scotland, and Ireland

(Encyclopedia)James II, 1633–1701, king of England, Scotland, and Ireland (1685–88); second son of Charles I, brother and successor of Charles II. James made an effort to restore himself by landing in Irel...

Brahe, Tycho

(Encyclopedia)Brahe, Tycho tīˈkō brä [key], 1546–1601, Danish astronomer. The most prominent astronomer of the late 16th cent., he paved the way for future discoveries by improving instruments and by his prec...

Justice, United States Department of

(Encyclopedia)Justice, United States Department of, federal executive department established in 1870 and charged with providing the means for enforcing federal laws, furnishing legal counsel in federal cases, and c...

Jefferson, Territory of

(Encyclopedia)Jefferson, Territory of, in U.S. history, region that roughly encompassed the present-day state of Colorado, although extending 2° farther south and 1° farther north, organized by its inhabitants (1...

Declaration of the Rights of Man and Citizen

(Encyclopedia)Declaration of the Rights of Man and Citizen, a fundamental document of French constitutional history, drafted by Emmanuel Sieyès, adopted by the Constituent Assembly on Aug. 26, 1789, and embodied i...

Elizabeth, empress of Austria and queen of Hungary

(Encyclopedia)Elizabeth, 1837–98, empress of Austria and queen of Hungary. A Bavarian princess, she was married (1854) to her cousin, Emperor Francis Joseph. Despite her exceptional beauty, intelligence, and kind...