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Prism dioptres. Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
Several stories within the One Thousand and One Nights (Arabian Nights, 8th–10th centuries CE) also feature science fiction elements.One example is "The Adventures of Bulukiya", where the protagonist Bulukiya's quest for the herb of immortality leads him to explore the seas, journey to the Garden of Eden and to Jahannam (Islamic hell), and travel across the cosmos to different worlds much ...
Fantasy cartography, fictional map-making, or geofiction is a type of map design that visually presents an imaginary world or concept, or represents a real-world geography in a fantastic style. [1] Fantasy cartography usually manifests from worldbuilding and often corresponds to narratives within the fantasy and science fiction genres.
Geocriticism is a method of literary analysis and literary theory that incorporates the study of geographic space. The term designates a number of different critical practices. In France, Bertrand Westphal has elaborated the concept of géocritique in several works. [1] In the United States, Robert Tally has argued for a geocriticism as a ...
Esophoria is an eye condition involving inward deviation of the eye, usually due to extra-ocular muscle imbalance. It is a type of heterophoria. Cause. Causes include: Refractive errors; Divergence insufficiency; Convergence excess; this can be due to nerve, muscle, congenital or mechanical anomalies.
Science fiction is a genre of fiction. It differs from fantasy in that, within the context of the story , its imaginary elements are largely possible within scientifically established or scientifically postulated laws of nature (though some elements in a story might still be pure imaginative speculation).
t. e. Space exploration, as predicted in August 1958 by the science fiction magazine Imagination. Science fiction (sometimes shortened to SF or sci-fi) is a genre of speculative fiction, which typically deals with imaginative and futuristic concepts such as advanced science and technology, space exploration, time travel, parallel universes, and ...
The concepts of space stations and space habitats feature in science fiction. The difference between the two is that habitats are larger and more complex structures intended as permanent homes for substantial populations (though generation ships also fit this description, they are usually not considered space habitats as they are heading for a ...
Frederik Pohl. Frederik George Pohl Jr. ( / poʊl /; November 26, 1919 – September 2, 2013) was an American science-fiction writer, editor, and fan, with a career spanning nearly 75 years—from his first published work, the 1937 poem "Elegy to a Dead Satellite: Luna", to the 2011 novel All the Lives He Led. [1]
This is a timeline of science fiction as a literary tradition. While the date of the start of science fiction is debated, this list includes a range of Ancient, Medieval, and Renaissance-era precursors and proto-science fiction as well, as long as these examples include typical science fiction themes and topoi such as travel to outer space and encounter with alien life-forms.