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Time has long been a major subject of study in religion, philosophy, and science, but defining it in a manner applicable to all fields without circularity has consistently eluded scholars. To get an idea what a great variety of opinion there is keep in mind that Isaac Newton considered time to be absolute but according to Einstein time is more flexible and relative in scope.
Source:Wikipedia, Image: flickr.com, Photo by DonkeyHotey
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The Soviet Union experimented with five- and six-day weeks between 1929 and 1931. Despite their agony to differentiate their social schedules from the West, the experiment failed miserably and the seven-day week was reinstated in 1940.
Source: soviet-empire.com, Image: Wikipedia
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Artifacts from the Paleolithic period suggest that the moon was used to reckon time as early as six thousand years ago. Lunar calendars were among the first to appear, either twelve or thirteen lunar months (either 354 or 384 days).
Source: encyclopedia.com, Image: Wikipedia
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A large variety of devices have been invented to measure time. The study of these devices is called horology. An Egyptian device that dates to about 1500 BCE, similar in shape to a bent T-square, measured the passage of time from the shadow cast by its crossbar on a nonlinear rule. The T was orientated eastward in the mornings. At noon, the device was turned around so that it could cast its shadow in the direction of the nightfall.
Source: Wikipedia, Image: Wikipedia
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Immanuel Kant, in the Critique of Pure Reason, described time as an a priori intuition that allows us (together with the other a priori intuition, space) to comprehend sense experience. With Kant, neither space nor time are conceived as substances, but rather both are elements of a systematic mental framework that necessarily structures the experiences of any rational agent, or observing subject.
Source: plato.stanford.edu, Image: Wikipedia
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