crossword puzzle above by hunting vertically, horizontally or diagonally 1. A competing model of the universe were the sun is the center of the universe. 2. It is when day and night are of equal length 3. It is the movement of any object on Earth 4. It is then path of the sun through the celestial sphere. 5. It happens when the sun's position in the ecliptic reaches its norther/southern most point 6. A competing model of the universe were the earth is the center of the universe. 7. It is the point at which the planet is nearest to the sun 8. It is the point at which the planet is farthest from the sun 9. He built armillary instruments to measure the correct elevation of stars and planets 10. He proposed a refinement of the geocentric model of the universe 11. He proposed the 3 law of planetary motion 12. It refers to a change of position with respect to time 13. It is a type of motion that involves an object being thrown or fired near earth's surface. 14.It is a property of an object that describes how much it will resist change to the motion of the object 15. It is the time rate of change of velocity