Parth termyn

Mappa Parthow Termyn Savonek an Bys (herwydh mis Est 2015)

Parth termyn ew an for dell ew radnys an bes dhe 24 parth, pub onan gen ken termyn, ha ken hanow, pan vo komparys gen UTC (Termyn Ollvysel Kesordenys – Co-ordinated Universal Time). E tallethas UTC avel Termyn Kresek Greenwich (Greenwich Mean Time) en 1675. Hebm o pan veu derevys an Sterva Riel en Greenwich rag gweres gorholyon dhe gavos aga dorhes war an mor. GMT o an savon pan synji pub cita termyn leel dyffrans. Bes pan dhallathas hensyow horn treusperthi meur a dus en uskis tredh citys gen termynyow dyffrans, anjei a usya parthow termyn rag sempelhe oberyansow. Erbydn 1900, ogas dhe bub termyn oll war an bes o en furv parthow termyn.

Erbydn lebmyn UTC ew savon termyn dres an bes. Pub radn a’n bes ew rekordys (plus po minus) herwydh aga dorhes, dell ew usys gen our dien, bes terweythyow gen hanter our po 45 mynysen.

Nebes radnow an bes a us Termyn Difres Golow Dydh (Daylight Saving Time), ha dres an spys ma, keworrys ew udn our dh’aga our howlyek usadow.

Niverys ew an parthow termyn komparys gen UTC, etho an barth termyn en Los Angeles vydh UTC−8, en Loundres UTC+0, en Rom UTC+1, hag en Delhi Nowydh UTC+5:30.

Ma an erthygel ma usya an Furv Skrifys Savonek a-barth Kernowek diwedhes.