astronomic boundary

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• Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… …   Wikipedia

• Joseph Smith Harris — Infobox Person box width = 250px name = Joseph Smith Harris image width = 300px caption = Joseph Smith Harris, aged about 65. birth date = birth date|1836|4|29|df=y birth place = East Whiteland Township, Chester County, Pennsylvania, United… …   Wikipedia

• Chronozone — For articles dealing with the fundamentals of geologic chronology, see: Biostratigraphy#Concept of zone, chronology (geology), and geologic time scale e  h Units in geochronology and stratigraphy …   Wikipedia

• Gregorian calendar — For the calendar of religious holidays and periods, see Liturgical year. For this year s Gregorian calendar, see Common year starting on Saturday. 2011 in other calendars Gregorian calendar 2011 MMXI …   Wikipedia

• Time — This article is about the measurement. For the magazine, see Time (magazine). For other uses, see Time (disambiguation). The flow of sand in an hourglass can be used to keep track of elapsed time. It also concretely represents the present as… …   Wikipedia

• Milankovitch cycles — Past and future Milankovitch cycles. VSOP allows prediction of past and future orbital parameters with great accuracy. ε is obliquity (axial tilt). e is eccentricity. ϖ is longitude of perihelion. esin(ϖ) is the precession index, which together… …   Wikipedia

• Washington meridian — The Washington meridian was one of four prime meridians of the United States which passed through Washington, D.C.. The four which have been specified are: # through the Capitol # through the White House # through the old Naval Observatory #… …   Wikipedia

• Guatemala — Guatemalan, adj., n. /gwah teuh mah leuh/; Sp. /gwah te mah lah/, n. 1. a republic in N Central America. 11,558,407; 42,042 sq. mi. (108,889 sq. km). 2. Also called Guatemala City. a city in and the capital of this republic. 917,322. * * *… …   Universalium

• biblical literature — Introduction       four bodies of written works: the Old Testament writings according to the Hebrew canon; intertestamental works, including the Old Testament Apocrypha; the New Testament writings; and the New Testament Apocrypha.       The Old… …   Universalium

• Anno Domini — This article is about the designation of years. For other uses, see Anno Domini (disambiguation). AD redirects here. For other uses, see AD (disambiguation). Dionysius Exiguus invented Anno Domini years to date Easter. Anno Domini (abbreviated as …   Wikipedia

• Calendar — For other uses, see Calendar (disambiguation). For the Gregorian calendar for this year, see Common year starting on Saturday. A page from the Hindu calendar 1871–1872. A calendar is a system of organizing days for social, religious, commercial,… …   Wikipedia