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Arts & crafts
Arts & crafts comprises a multitude of activities and hobbies that involve making things with one's hands, usually from scratch. They can be sub-divided into 'handicrafts'( or traditional crafts ) that are fashioned in an old style using long practised techniques, and the rest which are more modern inventions that have become recent trends or fads.
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Astronomy; General astronomy
A region of space lying between Mars (1.5 AU) and Jupiter (5.2 AU), where the great majority of the asteroids are found. None of the belt asteroids have retrograde motion.
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Astronomy; General astronomy
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astrometry
Astronomy; General astronomy
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astronomical horizon event
Astronomy; General astronomy
The time and azimuth at which a celestial body crosses the astronomical horizon of an oberver.
astronomical refraction
Astronomy; General astronomy
The change in direction of travel (bending) of a light ray as it passes obliquely through the atmosphere. As a result of refraction, the observed altitude of a celestial object is ...
astronomical unit (AU)
Astronomy; General astronomy
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