coordinate clock
71Week — For more details on each day of the week, see Weekday names. For the TV station in the Peoria Bloomington, Illinois market, see WEEK TV. Weeks redirects here. For other uses, see Weeks (disambiguation). A week is a time unit equal to seven days.… …
72Year — A year (from Old English gēar) is the orbital period of the Earth moving around the Sun. For an observer on Earth, this corresponds to the period it takes the Sun to complete one course throughout the zodiac along the ecliptic. In astronomy, the… …
73Frame of reference — A frame of reference in physics, may refer to a coordinate system or set of axes within which to measure the position, orientation, and other properties of objects in it, or it may refer to an observational reference frame tied to the state of… …
74Chronon — A chronon is a proposed quantum of time, that is, a discrete and indivisible unit of time as part of a theory that proposes that time is not continuous. While time is a continuous quantity in both standard quantum mechanics and general relativity …
75Chronometry — (from Greek χρόνος time and μέτρηση measurement ) is the science of the measurement of time, or timekeeping. It should not to be confused with chronology, the science of locating events in time, which often relies upon it. See also Chronometer… …
76OMA (time signal) — OMA was the callsign of a Czech time signal station. The station was operated by the Astronomical Institute of Prague and the transmitters were located at RKS Liblice 1. The station transmitted in the LF band on 50 kHz with a power of 7 kW and in …
77Century leap year — In the Gregorian calendar, an end of century leap year (often improperly referred to as a century leap year) is a year that is exactly divisible by 400 and, as with every other leap year, qualifies for the intercalation of February 29. End of… …
78Duration (music) — Simple [quadr]duple drum pattern, against which duration is measured in much popular music: divides two beats into two   …
79Term (time) — Midterm redirects here. For the academic test, see Exams. For the type of U.S. election, see United States midterm election. A term is a period of duration, time or occurrence, in relation to an event. To differentiate an interval or duration,… …
80Introduction to gauge theory — This article is an accessible, non technical introduction to the subject. For the main encyclopedia article, see Gauge theory. Quantum field theory …
