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daylight saving time
(Encyclopedia)daylight saving time (DST), time observed when clocks and other timepieces are set ahead so that the sun will rise and set later in the day as measured by civil time. The amount of daylight on a given...standard time
(Encyclopedia)standard time, civil time used within a given time zone. The earth is divided into 24 time zones, each of which is about 15° of longitude wide and corresponds to one hour of time. Within a zone all c...rhythm, biological
(Encyclopedia)rhythm, biological, or biorhythm, cyclic pattern of physiological changes or changes in activity in living organisms, most often synchronized with daily, monthly, or annual cyclical changes in the env...Harrison, Jim
(Encyclopedia)Harrison, Jim (James Thomas Harrison), 1937–2016, American novelist, poet, and essayist, b. Grayling, Mich., grad. Michigan State Univ. (B.A., 1960; M.A., 1965). He began his writing career as a poe...Kimball, Sumner Increase
(Encyclopedia)Kimball, Sumner Increase, 1834–1923, organizer of the U.S. Life-Saving Service, b. Lebanon, Maine. A lawyer, he became (1871) head of the revenue marine service of the Treasury Dept., and his invest...frozen foods
(Encyclopedia)frozen foods, products of the food preservation process of freezing. This process has been employed by people in the Arctic from prehistoric times. Eskimos throw fresh-caught fish on the ice to freeze...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...Mercury, in astronomy
(Encyclopedia)Mercury, in astronomy, nearest planet to the sun, at a mean distance of 36 million mi (58 million km); its period of revolution is 88 days. Mercury passes through phases similar to those of the moon a...corona, in astronomy
(Encyclopedia)corona, luminous envelope surrounding the sun, outside the chromosphere. Its density is less than one billionth that of the earth's atmosphere. The corona is visible only at the time of totality durin...Hammerfest
(Encyclopedia)Hammerfest häˈmərfĕst [key], town, Finnmark co., N Norway, on Kvaløy island. It is the n...Browse by Subject
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