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Maskelyne, Nevil

(Encyclopedia)Maskelyne, Nevil măsˈkəlīn [key], 1732–1811, English astronomer. Maskelyne received his education at Westminster School and Trinity College, Cambridge. Appointed astronomer royal at the Royal Ob...

Mayer, Johann Tobias

(Encyclopedia)Mayer, Johann Tobias yōˈhän tōbēˈäs mīˈər [key], 1723–62, German mathematician and astronomer. In 1751 he became professor of economics and mathematics at the Univ. of Göttingen, and in 1...

Grumman, Leroy Randle

(Encyclopedia)Grumman, Leroy Randle, 1895–1982, American aviation pioneer and aerospace executive, b. Huntington, N.Y. After graduating from Cornell (1916), he joined the U.S. navy, where he served as a flight in...

Ramadan

(Encyclopedia)Ramadan rämädänˈ, rămˌədänˈ [key], in Islam, the ninth month of the Muslim year, during which all Muslims must fast during the daylight hours. Indulgence of any sort is forbidden during the f...

Perrine, Charles Dillon

(Encyclopedia)Perrine, Charles Dillon pərīnˈ [key], 1867–1951, American astronomer, b. Steubenville, Ohio. He was on the staff of Lick Observatory (1893–1909) and was (1909–36) director of the Argentine Na...

Tet offensive

(Encyclopedia)Tet offensive, 1968, a series of crucial battles in the Vietnam War. On Jan. 31, 1968, the first day of the celebration of the lunar new year, Vietnam's most important holiday, the Vietnamese Communis...

Lockyer, Sir Joseph Norman

(Encyclopedia)Lockyer, Sir Joseph Norman lŏkˈyər [key], 1836–1920, English astronomer, educated on the Continent. One of the first to make a spectroscopic examination of the sun and stars, he devised (1868), i...

calendar

(Encyclopedia)calendar [Lat., from Kalends], system of reckoning time for the practical purpose of recording past events and calculating dates for future plans. The calendar is based on noting ordinary and easily o...

Freundlich, Erwin Finlay

(Encyclopedia)Freundlich, Erwin Finlay froindˈlĭkh [key], 1885–1964, German astronomer. Freundlich obtained a doctorate in mathematics at Göttingen, then joined the Royal Observatory at Berlin, where he worked...

pyroxene

(Encyclopedia)pyroxene pīˈrŏksēn [key], name given to members of a group of widely distributed rock minerals called metasilicates in which magnesium, iron, and calcium, often with aluminum, sodium, lithium, man...