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The body of light, sometimes called the 'astral body' [a] or the 'subtle body,' [b] is a "quasi material" [1] aspect of the human body, being neither solely physical nor solely spiritual, posited by a number of philosophers, and elaborated on according to various esoteric, occult, and mystical teachings.
Lamps appear in the Torah and other Jewish sources as a symbol of "lighting" the way for the righteous, the wise, and for love and other positive values. While fire was often described as being destructive, light was given a positive spiritual meaning. The oil lamp and its light were important household items, and this may explain their symbolism.
Astral projection (also known as astral travel, soul journey, soul wandering, spiritual journey, spiritual travel) is a term used in esotericism to describe an intentional out-of-body experience (OBE) [1] [2] that assumes the existence of a subtle body, known as the astral body or body of light, through which consciousness can function separately from the physical body and travel throughout ...
1st century AD – Pliny the Elder in his Natural History records the story of Magnes the shepherd who discovered the magnetic properties of some iron stones. [6] 160 AD – Claudius Ptolemy writes his book Optics on reflection and refraction of light, and tabulated angles of refraction for several media. He found a refraction law valid for ...
Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek philosophers, and the development of geometrical optics in the Greco-Roman world. The word optics is derived from the Greek term τα ὀπτικά meaning 'appearance, look'. [1]
There is very little evidence that any strictly liturgical use was made of lamps in the early centuries of Christianity.The fact that many of the services took place at night, and that after the lapse of a generation or two the meetings of the Christians for purposes of worship were held, at Rome and elsewhere, in the subterranean chambers of the Catacombs, make it clear that lamps must have ...
1962 Nick Holonyak Jr. develops the first practical visible-spectrum (red) light-emitting diode. 1963 Kurt Schmidt invents the first high pressure sodium-vapor lamp. [17] 1972 M. George Craford invents the first yellow light-emitting diode. 1972 Herbert Paul Maruska and Jacques Pankove create the first violet light-emitting diode.
1878 – Thomas Edison, following work on a "multiplex telegraph" system and the phonograph, invents an improved incandescent light bulb. This was not the first electric light bulb but the first commercially practical incandescent light. In 1879 he produces a high-resistance lamp in a very high vacuum; the lamp lasts hundreds of hours. While ...