The Santa Clara County, California, medical examiner's office said the actor was 71, but other reports list his age as 72.
Time is used to define other quantities—such as velocity—so defining time in terms of such quantities would result in circularity of definition.
An operational definition of time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) constitutes one standard unit such as the second, is highly useful in the conduct of both advanced experiments and everyday affairs of life.
May 27: Gregg Allman, a founding member of the Allman Brothers Band who overcame family tragedy, drug addiction and health problems to become a grizzled elder statesman for the blues music he loved, died at 69. 18: Omar Abdel-Rahman, an Egyptian-born cleric serving a life sentence for plotting the 1993 bombing at the World Trade Center and other terror attacks in New York, died from natural causes at age 78.
March 21: Martin Mc Guinness , former deputy first minister of Northern Ireland, Sinn Fein's chief negotiator during the Northern Ireland peace process and longtime commander in the Irish Republican Army, died Monday after a short illness. Actor Richard Hatch, known for his role as Captain Apollo in the 1978-1979 TV series "Battlestar Galactica," died Feb 7 of pancreatic cancer.
Weitz was an astronaut for 28 years and served as pilot on the Skylab 2 mission in 1973.
He also led the first Challenger crew when it was launched on April 4, 1983. 1: The magazine industry lost a legend when Si Newhouse Jr., center, the longtime publisher of Condé Nast and driving force behind some of the most recognizable titles on newsstands, died at 89. 23: Singer Charles Bradley, who was known as the "Screaming Eagle of Soul" because of his raspy voice and stirring performances, died at 68. 19: Former Archbishop of Boston Cardinal Bernard Law, whose legacy amid the clergy sex abuse scandal ushered in a painful era for the nation and the Roman Catholic Church, died in Rome at 86 after a long illness. 12: Pat Di Nizio of the Smithereens died at the age of 62.Di Nizio was lead singer and guitar player of the band with hits in the late '80s and early '90s such as, "Blood and Roses" and "A Girl Like You." Nov. 24: Actor Robert Guillaume, best known for his title role in the TV series "Benson," died at 89.This second view, in the tradition of Gottfried Leibniz See Units of Time.Time is one of the seven fundamental physical quantities in both the International System of Units and International System of Quantities.Without intercalation to add days or months to some years, seasons quickly drift in a calendar based solely on twelve lunar months.