Time is usual to define other quantities – such as velocity – so defining time in terms of such quantities would result in circularity of definition.
It does not address why events can happen forward and backwards in space, whereas events only happen in the forward progress of time.
Time is one of the seven fundamental physical quantities in both the International System of Units and International System of Quantities.
Time is the indefinite continued progress of existence and events occur in an apparently irreversible succession from the past, through the present, into the future.
Currently, the international unit of time, the second, is defined by measuring the electronic transition frequency of caesium atoms.
Periodic events and periodic motion own long served as standards in support of units of time.
Investigations into the relationship between space and time led physicists to define the spacetime continuum.
Some Main Idea about TIME:
😊The anti-realists believed time is merely a convenient intellectual idea in support of humans to aware events.
😊UTC time is established on the SI second, which was first defined in 1967, and is established on the use of atomic clocks.
😊Philosophers in the 17th and 18th century questioned if time was real and absolute, or if it was an intellectual idea humans use to aware and sequence events.
😊Using space to think about time allows humans to mentally organize temporal events in a specific way.
😊The past and future light cones are absolute, the “present” is a relative idea different in support of observers in relative motion.
Source:
[1] Wikipedia Contributors. “Time.” Wikipedia, Wikimedia Foundation, 22 Oct. 2020, en.wikipedia.org/wiki/Time. Accessed 2 Nov. 2020.
[2] ArtTower. “Ancient Antique Architecture – Free Image on Pixabay.” Pixabay.Com, 27 Feb. 2020, pixabay.com/illustrations/ancient-antique-architecture-4882999/. Accessed 2 Nov. 2020.