UTC is kept within 0.9 second of UT1 by the introduction of one-second steps to UTC, the "leap second". The Global Positioning System broadcasts a very precise time signal based on UTC time. The surface of the Earth is split up into a number of time zones. Standard time or civil time in a time zone deviates a fixed, round amount, usually a whole number of hours, from some form of Universal Time, usually UTC. Most time zones are exactly one hour apart, and by convention compute their local time as an offset from UTC. For example, time zones at sea are based on UTC. In many locations (but not at sea) these offsets vary twice yearly due to daylight saving time transitions. Some other time standards are used mainly for scientific work. Terrestrial Time is a theoretical ideal scale realized by TAI. Geocentric Coordinate Time and Barycentric Coordinate Time are scales defined as coordinate times in the context of the general theory of relativity. Barycentric Dynamical Time is an older relativistic scale that is still in use. Philosophy
Religion
Linear and cyclical
Ancient cultures such as Incan, Mayan, Hopi, and other Native American Tribes – plus the Babylonians, ancient Greeks, Hinduism, Buddhism, Jainism, and others – have a concept of a wheel of time: they regard time as cyclical and quantic, consisting of repeating ages that happen to every being of the Universe between birth and extinction.In general, the Islamic and Judeo-Christian world-view regards time as linear
and directional,
beginning with the act of creation by God.
Wheal may refer to:

Wheals, a type of skin lesion
Brad Wheal (born 1996), British cricketer
Donald James Wheal (1931–2008), British British television writer, novelist and non-fiction writer
David John Wheal, Australian businessman
"The Wheal", a 1987 song by Coil

See also
All pages with titles containing Wheal
Mining in Cornwall and Devon, includes mines whose names include Wheal
Wheel (disambiguation)