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sidereal year

(Encyclopedia)sidereal year, time required for the earth to complete an orbit of the sun relative to the stars. The sidereal year is 365 days, 6 hr, 9 min, 9.5 sec of mean solar time (see solar time). It is 20 min ...

day

(Encyclopedia)day, period of time for the earth to rotate once on its axis. The ordinary day, or solar day, is measured relative to the sun, being the time between successive passages of the sun over a stationary o...

Simkhovitch, Mary Kingsbury

(Encyclopedia)Simkhovitch, Mary Kingsbury sĭmkōˈvĭch [key], 1867–1951, American social worker, b. Chestnut Hill, Mass., grad. Boston Univ., 1890. After further study at Radcliffe, Columbia, and the Univ. of B...

Argyll, John Campbell, 2d duke of

(Encyclopedia)Argyll, John Campbell, 2d duke of, 1678–1743, Scottish general; son of the 1st duke, whom he succeeded in 1703. For his ardent support of the union of England and Scotland he was created (1705) earl...

year

(Encyclopedia)year, time required for the earth to complete one orbit about the sun. The solar or tropical year is measured relative to the sun and is equal to 365 days, 5 hr, 48 min, 46 sec of mean solar time (see...

Flamsteed, John

(Encyclopedia)Flamsteed, John flămˈstēd [key], 1646–1719, English astronomer. He was appointed (1675) astronomer royal by King Charles II and carried on his researches at Greenwich Observatory. Over his protes...

anomalistic year

(Encyclopedia)anomalistic year ənŏmˌəlĭsˈtĭk [key], time required for the earth to go from the perihelion point once around the sun and back to the perihelion point. It is 365 days, 6 hr, 13 min, 53.0 sec of...

catholic church

(Encyclopedia)catholic church [Gr.,=universal], the body of Christians, living and dead, considered as an organization. The word catholic was first used c.110 to describe the Church by St. Ignatius of Antioch. In s...

second

(Encyclopedia)second, abbr. sec or s, fundamental unit of time in all systems of measurement. In practical terms, the second is 1/60 of a minute, 1/3,600 of an hour, or 1/86,400 of a day. Since the length of the da...

Woolwich

(Encyclopedia)Woolwich, Greater London, England: see Greenwich. ...