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'''Park Ji-Sung''' (born [[25 February]] [[1981]] in [[Seoul]]) is a [[football (soccer)|football]] player from [[South Korea]]. He is most famous for scoring the winning goal for [[South Korea national football team|South Korea]] against [[Portugal national football team|Portugal]] during the [[Football World Cup 2002]] tournament group stages. Since [[2001]] he has been playing for [[Netherlands|Dutch]] club [[PSV Eindhoven]].
'''Metric time''' is the measure of time interval using the [[SI|metric system]], which defines the [[second]] as the base unit of time, and multiple and submultiple units formed with [[SI prefix|metric prefixes]], such as kiloseconds and milliseconds. It does not define the time of day, as this is defined by various time scales, which may be based upon the metric definition of the second. Other units of time, the [[minute]], [[hour]], and [[day]], are accepted for use with the modernized metric system, but are not part of it.
== HistoryExternal link ==
*[http://english.psv.nl/show?id=9720&dbid=604&typeofpage=22365 Park's page in PSV English-language website]
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When the metric system was introduced in [[France]] in [[1795]], it included units for length, area, dry volume, liquid capacity, weight or mass, and even currency, but not for time. [[Decimal time]] of day had been introduced in France two years earlier, but was set aside at the same time the metric system was inaugurated, and did not follow the metric pattern of a base unit and prefixed units. [[James Clerk Maxwell]] and [[Elihu Thomson]] (through the [[British Association for the Advancement of Science]] - BAAS) introduced the [[Centimetre gram second system of units]] (cgs) in [[1874]], in order to derive electric and magnetic metric units, following the recommendation of [[Carl Friedrich Gauss]] in [[1832]].
[[Category:1981 births]]
[[Category:South Korean footballers]]
[[ja:朴智星]]
The ephemeris second (defined as 1/86400 of a mean solar day) was made one of the original base units of the modernized metric system, or [[International System of Units]] (SI), at the 10th [[Conférence Générale des Poids et Mesures|General Conference on Weights and Measures]] (CGPM) in [[1954]]. The SI second was later redefined more precisely as a certain number of vibrations of the [[cesium]] 133 atom equivalent to the previous definition.
== Alternative Units ==
Numerous proposals have been made for alternative base units of metric time. One of these is the day, itself, with mulitple and submultiple units such as [[deci|decidays]], [[centi|centidays]], [[milli|millidays]], etc. Other base units equivalent to decimal divisions of the day, such as 1/10, 1/100, 1/1000, 1/100,000 or 1/1,000,000 day, or other divisions of the day, such as 1/20 or 1/40 day, have also been proposed, with names such as tick, sekant, meck, chi, chron, etc., and multiple and submultiple units formed with metric prefixes. None have had any notable acceptance, however.
== Alternative Meaning ==
Metric time properly refers to measurement of time interval, while [[decimal time]] refers to the time of day. Standard time of day is defined by various time scales, such as [[UTC]], which are now usually based upon the metric base unit of time, the second. Some proposals for alternative units of metric time are accompanied by decimal time scales for telling the time of day based upon these alternative units. Other proposals called "metric time" refer only to decimal time, and therefore are not truly metric.
[[France|French]] decimal time is sometimes called "metric time" because it was introduced around the same time as the metric system and both were decimal, but it was not part of the decree creating the original metric system and its units were named for the [[hour]], [[minute]] and [[second]], instead of using metric prefixes. Other decimal time standards, such as [[Swatch Internet Time]], are not considered metric time.
==See also==
* [[Decimal time]]
==External links==
* [http://zapatopi.net/metrictime.html A Guide to Metric Time] (Reffers to alternate meaning)
* [http://www.decimaltime.hynes.net/metric.html Decimal Time - Metric Time]
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