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Neptune, in astronomy

(Encyclopedia)Neptune, in astronomy, 8th planet from the sun at a mean distance of about 2.8 billion mi (4.5 billion km) with an orbit lying between those of Uranus and the dwarf planet Pluto; its period of revolut...

rare earths

(Encyclopedia)rare earths, in chemistry, oxides of the rare-earth metals. They were once thought to be elements themselves. They are widely distributed in the earth's crust and are fairly abundant, although they we...

solar constant

(Encyclopedia)solar constant, the average amount of radiant energy received by the earth's atmosphere from the sun; its value is about 2 calories per min incident on each square centimeter of the upper atmosphere. ...

anticyclone

(Encyclopedia)anticyclone, region of high atmospheric pressure; anticyclones are commonly referred to as “highs.” The pressure gradient, or change between the core of the anticyclone and its surroundings, combi...

Latter-day Saints, Church of Jesus Christ of

(Encyclopedia)Latter-day Saints, Church of Jesus Christ of, name of the church founded (1830) at Fayette, N.Y., by Joseph Smith. The headquarters are in Salt Lake City, Utah. Its members, now numbering about 5.7 mi...

eclipse

(Encyclopedia)CE5 A. Lunar eclipse B. Solar eclipse eclipse ēklĭpsˈ, ĭ– [key] [Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lu...

midnight sun

(Encyclopedia)midnight sun, phenomenon in which the sun remains visible in the sky continuously for 24 hr or longer, occurring only in the polar regions. The midnight sun is due to the fact that the plane of the ea...

Buck, Pearl Sydenstricker

(Encyclopedia)Buck, Pearl Sydenstricker sīˈdənstrĭkˌər [key], 1892–1973, American author, b. Hillsboro, W.Va., grad. Randolph-Macon Women's College, 1914, the first American woman to receive (1938) the Nobe...

precession of the equinoxes

(Encyclopedia)CE5 Precession of the equinoxes (the points at which the earth's celestial equator intersects its ecliptic) is due to the slow rotation of the earth's axis around a perpendicular to the ecliptic. ...

holiday

(Encyclopedia)holiday [altered from holy day], day set aside for the commemoration of an important event. Holidays are often accompanied by public ceremonies, such as parades and carnivals, and by religious observa...