Across
- 3. the lens or system of lenses in a telescope or microscope that is nearest the object being viewed.
- 4. 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.
- 5. structure of concepts, values, customs, views, etc., by means of which an individual or group perceives or evaluates data, communicates ideas, and regulates behavior.
- 6. Co-ordinates Locate a celestial body relative to a fixed earth (as though the celestial bodies are circling Earth)
- 8. to subject to refraction.
- 9. having or representing the sun as a center: the heliocentric concept of the universe.
- 12. All objects seen in the sky (the sun, moon, stars, and planets)
- 15. Astronomy . the angular distance of a heavenly body above the horizon.
- 16. Optics. the ability of an optical device to produce separate images of close objects.
- 17. the act of reflecting or the state of being reflected.
- 18. an instrument for determining directions, as by means of a freely rotating magnetized needle that indicates magnetic north.
- 20. The lens through which you view a magnified object using a telescope
Down
- 1. 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and navigation: used by Greek astronomers from about 200 b.c. and by Arab astronomers from the Middle Ages until superseded by the sextant.
- 2. Newton’s law states that all objects attract all other objects and provides an explanation for the planets’ elliptical orbits
- 7. having or representing the sun as a center: the heliocentric concept of the universe.
- 10. having or representing the earth as a center: a geocentric theory of the universe.
- 11. (formerly) a celestial body moving in the sky, as distinguished from a fixed star, applied also to the sun and moon.
- 12. any of various groups of stars to which definite names have been given, as Ursa Major, Ursa Minor, Boötes, Cancer, Orion.
- 13. having or representing the earth as a center: a geocentric theory of the universe.
- 14. The lens through which you view a magnified object using a telescope
- 19. 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.