Philosophy of time

300px|thumb|upright=1.5|The Zeitpyramide in 2023

The present is the period of time that is occurring right now. The present is in contrast to the past, the period of time that has already occurred; and the future, the period of time that has yet to occur.

thumb|upright=1.5|A picture of a basketball bouncing, composed of frames taken at different points in the past

Eternity, also referred to as sempiternity or forever, is time with no end i.e. infinite.

branch of cosmology which studies mathematical models of the universe

treatise by Aristotle

alt=An image of a total solar eclipse at Orin Junction, Wyoming in 2017. A total solar eclipse happens when the Moon completely blocks the face of the Sun. It is the result of a cosmic coincidence. Even though the Sun is about 400 times bigger than the Moon, it is also about 400 times farther away. This makes the Sun and the Moon appear almost exactly the same size in our sky. |thumb|Solar eclipse of August 21, 2017|A total solar eclipse at Orin Junction, Wyoming in 2017. A total solar eclipse happens when the [[Moon completely blocks the face of the Sun. It is the result of a cosmic coinciden

philosophical concept regarding infinite continuance of the universe

theoretical foundation of Newtonian mechanics

one-way direction, or asymmetry, of time

system for representing and reasoning about time

branch of philosophy relating to spatiality and temporality

View that past, present and future exist

perception of the passing of time

Wick-rotated time coordinates in relativistic field theory

thumb|upright=1.2|Hamlet, Prince of Denmark, Act I, Scene IV by Henry Fuseli (1789)

objects in time or instantiations of properties in objects (in philosophy)

conceptual conflict between general relativity and quantum mechanics

1908 academic journal article by J. Ellis McTaggart

Philosophical terms regarding the temporal ordering of events

In philosophy, temporality refers to the idea of a linear progression of past, present, and future. The term is frequently used, however, in the context of critiques of commonly held ideas of linear time. In social sciences, temporality is studied with respect to the human perception of time and the social organization of time. The perception of time in Western thought underwent significant changes in the three hundred years between the Middle Ages and modernity.

Latin adage

philosophical theory in which the flow of time is only a subjective illusion of human consciousness and that the past, present and future are equally real, without ontological privileging of the present

philosophical question

essay by John William Dunne

theory of time and consciousness posited by the French philosopher Henri Bergson

book by Søren Kierkegaard

atomic clock with laser cooled single ions confined together in an electromagnetic ion trap

past and present exist while the future does not

Non-simultaneity or nonsynchronism (German: Ungleichzeitigkeit, sometimes also translated as non-synchronicity) is a concept in the writings of Ernst Bloch which denotes the time lag, or uneven temporal development, produced in the social sphere by the processes of capitalist modernization and/or the incomplete nature of those processes. The term, especially in the phrase "the simultaneity of the non-simultaneous", has been used subsequently in predominantly Marxist theories of modernity, world-systems, postmodernity and globalization.

book by Sean M. Carroll