Define relative dating and absolute dating
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A geological period is one of the several subdivisions of geologic time enabling cross-referencing of rocks and geologic events from place to place. These periods form elements of a hierarchy of divisions into which geologists have split the Earth's history. Eons and eras are larger subdivisions than periods while periods themselves may be divided into epochs and ages. The rocks formed during a period belong to a stratigraphic unit called a system. The twelve currently recognised periods of the present eon — the Phanerozoic — are defined by the International Commission on Stratigraphy ICS by reference to the stratigraphy at particular locations around the world. In the Ediacaran Period of the latest Precambrian was defined in similar fashion, and was the first such newly designated period in years; but earlier periods are simply defined by age.
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No work of science has drawn more attention from philosophers than Newton's Principia. The reasons for this, however, and consequently the focus of the attention have changed significantly from one century to the next. During the 20 th Century philosophers have viewed the Principia in the context of Einstein's new theory of gravity in his theory of general relativity. The main issues have concerned the relation between Newton's and Einstein's theories of gravity and what the need to replace the former with the latter says about the nature, scope, and limits of scientific knowledge. During most of the 18 th Century, by contrast, Newton's theory of gravity remained under dispute, especially because of the absence of a mechanism — in particular, a contact mechanism — producing gravitational forces.
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What is the Universe? That is one immensely loaded question! No matter what angle one took to answer that question, one could spend years answering that question and still barely scratch the surface.
In chronology and periodization , an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured. The moment of epoch is usually decided by congruity, or by following conventions understood from the epoch in question.