Humanism in the age of Henry VIII. London ; Dover, N.H. : Croom Helm, 1986 (OCoLC)795302915: Named Person: Henry, King of England; Henry, King of England; Henry, King of England: Document Type: Book: All Authors / Contributors: Maria Dowling
Prior to 1972, this time was called Greenwich Mean Time (GMT) but is now referred to as Coordinated Universal Time or Universal Time Coordinated (UTC). It is a coordinated time scale, maintained by the Bureau International des Poids et Mesures (BIPM). It is also known as Z time or Zulu Time.
Two components are used to determine UTC: 1  International Atomic Time (TAI) : A time scale that combines the output of some 400 highly precise atomic clocks worldwide, and provides the exact speed for our clocks to tick. 2  Universal Time (UT1), also known as astronomical time or solar time, refers to the Earth's rotation.