Topic 1 and 2 Vocabulary

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Across
  1. 2. having or representing the earth as a center: a geocentric theory of the universe.
  2. 4. to subject to refraction.
  3. 6. All objects seen in the sky (the sun, moon, stars, and planets)
  4. 8. structure of concepts, values, customs, views, etc., by means of which an individual or group perceives or evaluates data, communicates ideas, and regulates behavior.
  5. 9. having or representing the sun as a center: the heliocentric concept of the universe.
  6. 11. Co-ordinates Locate a celestial body relative to a fixed earth (as though the celestial bodies are circling Earth)
  7. 12. Optics. the ability of an optical device to produce separate images of close objects.
  8. 14. a plane curve such that the sums of the distances of each point in its periphery from two fixed points, the foci, are equal. It is a conic section formed by the intersection of a right circular cone by a plane that cuts the axis and the surface of the cone. Typical equation: ( x 2 / a 2 ) + ( y 2 / b 2 ) = 1. If a = b the ellipse is a circle.
  9. 15. an astronomical instrument for taking the altitude of the sun or stars and for the solution of other problems in astronomy and navigation: used by Greek astronomers from about 200 b.c. and by Arab astronomers from the Middle Ages until superseded by the sextant.
  10. 16. The lens through which you view a magnified object using a telescope
  11. 17. any of various groups of stars to which definite names have been given, as Ursa Major, Ursa Minor, Boötes, Cancer, Orion.
  12. 19. Astronomy,Navigation . the arc of the horizon measured clockwise from the south point, in astronomy, or from the north point, in navigation, to the point where a vertical circle through a given heavenly body intersects the horizon.
  13. 20. (formerly) a celestial body moving in the sky, as distinguished from a fixed star, applied also to the sun and moon.
Down
  1. 1. the lens or system of lenses in a telescope or microscope that is nearest the object being viewed.
  2. 3. having or representing the earth as a center: a geocentric theory of the universe.
  3. 5. Newton’s law states that all objects attract all other objects and provides an explanation for the planets’ elliptical orbits
  4. 7. having or representing the sun as a center: the heliocentric concept of the universe.
  5. 10. The lens through which you view a magnified object using a telescope
  6. 13. the act of reflecting or the state of being reflected.
  7. 17. an instrument for determining directions, as by means of a freely rotating magnetized needle that indicates magnetic north.
  8. 18. Astronomy . the angular distance of a heavenly body above the horizon.