Astronomy definitions Crossword
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
                                         
 
 
Down: 2)  a theory that places the Sun as the center of the universe, and the planets orbiting around it3) A flattened circle or oval. That the orbits of the planets are ellipses, not circles, was first discovered by Johannes Kepler based on the careful observations by Tycho Brahe. 4)  is a measure of how an orbit deviates from circular.5) a unit of distance equal to the distance that light travels in one year (about 5.88 trillion miles or 9.46 trillion kilometers8)  is an optical telescope which uses a single or combination of curved mirrors that reflect light and form an image.9)  is an imaginary point directly "above" a particular location, on the imaginary celestial sphere11) one half of the of the ellipse that one celestial body describes around another, as a planet around the sun.14) the line at which the earth's surface and the sky appear to meet.15)  is a star that, as viewed from a given latitude on Earth, never sets, due to its proximity to one of the celestial poles16)  is the geometric mean of the distance from the center to either focus and the distance from the center to either directrix19) is the apparent path of the Sun on the celestial sphere Across: 1)  is the point in the sky about which all the stars seen from the Northern Hemisphere rotate.6) esp in degrees, of a star, planet, etc, from the celestial equator measured north (positive) or south (negative) along the great circle passing through the celestial poles and the body7)  the circumpolar constellations are constellations that never set from the viewer's perspective. 10) An astronomical unit is a unit of length, roughly the distance from the Earth to the Sun. 12) a circle of constant longitude passing through a given place on the earth's surface and the terrestrial poles.13) using the earth or earthly life as the only basis of evaluation. viewed or measured as from the center of the earth15) an imaginary sphere of which the observer is the center and on which all celestial objects are considered to lie.17)  the time required for a body within the solar system, such as a planet, the Moon, or an artificial Earth satellite, 18)  the time required for a celestial body within the solar system to complete one revolution with respect to the fixed stars—i.e., as observed from some fixed point outside the system. 20) is the point in the sky about which all the stars seen from the Southern Hemisphere rotate.21)  one half the major axis of the ellipse that one celestial body describes around another, as a planet around the sun or a satellite around a planet, equivalent to the mean distance between the two bodies.22) the distance of a point east of the First Point of Aries, measured along the celestial equator and expressed in hours, minutes, and seconds.
 

 

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