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variable star
(Encyclopedia) variable star, star that varies, either periodically or irregularly, in the intensity of the light it emits. Other physical changes are usually correlated with the fluctuations in…Velde, van de
(Encyclopedia) Velde, van deVelde, van devän də vĕlˈdə [key], 17th-century Dutch family of artists. Jan van de Velde, 1593–1641, was a draftsman and engraver as well as a painter. His cousin Esaias…Mother's Day Gift Ideas for Kids
Cards, gift certificates, bookmarks, and other great ideas for mom this year by Erin Teare Martin Related Links Mothers of Invention Like Mother, Like Daughter Mothers by the Numbers…Spica
(Encyclopedia) SpicaSpicaspīˈkə [key], brightest star in the constellation Virgo; Bayer designation Alpha Virginis; 1992 position R.A. 13h24.8m, Dec. −11°07′. A bluish-white star of spectral class B1…April Fools' Day: Origin and History
The uncertain origins of a foolish day Related Links History of the Gregorian calendar Calendar and Holidays Equinox France History of the New Year April Fools' Day,…quantum electrodynamics
(Encyclopedia) quantum electrodynamics (QED), quantum field theory that describes the properties of electromagnetic radiation and its interaction with electrically charged matter in the framework of…time , sequential arrangement of all events
(Encyclopedia) time, sequential arrangement of all events, or the interval between two events in such a sequence. The concept of time may be discussed on several different levels: physical,…Walt Whitman: After the Dazzle of Day
After the Dazzle of DayAfter the dazzle of day is gone, Only the dark, dark night shows to my eyes the stars; After the clangor of organ majestic, or chorus, or perfect band, Silent, athwart…Walt Whitman: To-Day and Thee
To-Day and TheeThe appointed winners in a long-stretch'd game; The course of Time and nations—Egypt, India, Greece and Rome; The past entire, with all its heroes, histories, arts, experiments…Veterans' Day
(Encyclopedia) Veterans' Day, holiday formerly observed in the United States as Armistice Day in commemoration of the signing of the Armistice ending World War I. Nov. 11 officially became Veterans'…Trending
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