Astronomy

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Across
  1. 2. The law of ellipses which describes that the actual path followed by the planets was _______, not circular, with the Sun at one focus of the ellipse.
  2. 5. It is also called a satellite.
  3. 6. The Law of ________ describes that the square of a planet's orbital period, T2 is proportional to the cube of a planet's average distance from the Sun R³.
  4. 8. Motion Apparent yearly movement of the stars as observed from Earth as a direct effect of the Earth's revolution around the sun.
  5. 11. Sun revolves 360° a year around a path on the celestial sphere called ______.
  6. 12. This axis intersects the celestial sphere at a point in the northern sky and is presently lose to the northern star.
  7. 14. circle It is the circular path that the celestial bodies take to complete the diurnal motion.
  8. 15. They have discovered that Mercury, Venus, Mars, Jupiter, and Saturn are planets.
  9. 17. Pythagoras, an ancient Greek philosopher and his pupils were the first to propose that the earth is _____.
  10. 18. Kepler postulated that there must be a ______ from the Sun that moves the planets.
  11. 19. of Equal Areas It is states that when an imaginary line is drawn from the center of the Sun to the center of a planet, the line will sweep out an equal area of space in equal time intervals.
Down
  1. 1. In 500 to 430 BC, he further supported Pytagoras' proposal through his observations of the shadows that the Earth cast on the moon during a lunar eclipse.
  2. 3. of Ellipses Kepler's first law of Planetary Motion.
  3. 4. Brahe He was a Danish astronomer and nobleman who made accurate observations of the movement of celestial bodies in an observatory built for him by King Frederick II of Denmark in 1576.
  4. 7. Around 240 BC, he attempted to measure the circumference of the Earth.
  5. 9. He postulated that there must be a force from the Sun that moves the planets.
  6. 10. equinox A type of equinox that is only Happens in every 20th of march
  7. 13. Around 340 BC, he listed several arguments for a spherical earth that included the position of the North star, the shape of the moon and the sun, and the disappearance of the ships when they sail over the horizon.
  8. 16. Tables This table was the most accurate table that is known to the astronomical world.