Astronomy crossword puzzle

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Across
  1. 5. - the first successful attempt to determine the size of the arth was made by him by applying geometric principles;
  2. 7. - a huge planet, is shrouded in thick clouds that its surface cannot be seen Its volume is about 1,300 times that of earth, but its mass is only 300 times as great.
  3. 8. - Its famous rings, though it is much like Jupiter, characterize Saturn. The rings - two bright ones and a fainter inner one - surround the planet in the plane of its equator. The rings appear to be composed of many small bodies, which revolve around Saturn like miniature satellites.
  4. 13. - very first Greek to profess the heliocentric views
  5. 14. - the shape of the earth.
  6. 15. - appears only when the moon is on the side of the earth most directly in line with the sun. There is no illumination on the earth's side, so it is also sometimes called the dark moon.
  7. 17. - the figure of the moon that appears as a curve with pointy ends
  8. 18. - was ableto explain what causes the phases of the moon, To him, the moon shone only by reflected sunlight.
  9. 21. - Half the side of the moon facing the earth appears illuminated. It rises about noon, reaches its high point for the day at sundown, and sets near midnight.
  10. 23. - shrinking; describes the moon when the illuminated is decreasing
  11. 25. - gave the most accurate size during their time.
  12. 26. - believed that the Earth was the center of the universe.
  13. 27. - an obscuring of the light from one celestial body by the passage of another one between it
  14. 28. -was believed to be at fixed position in the sky, however when the Greeks traveled,to places nearer the equator, like• Egypt, they noticed that it is closer to the horizon
  15. 30. -a type of eclipse that occurs when the Moon passes between the Sun and Earth, and the Moon fully or partially
  16. 32. - the figure of the moon that is more than half full, looking swollen on one side.
Down
  1. 1. -A natural object that orbits a larger object.
  2. 2. - the smallest and the fastest of our neighbors, is somewhat larger than the moon and similar in appearance.
  3. 3. - Like the first quarter, it is seen illuminated on half the side facing the earth. The third quarter moon rises about midnight, is highest at dawn and sets about noon. In the morning it is in the western sky.
  4. 4. - The whole side of the moon is now illuminated to viewers from the earth. The full moon rises in the east as the sun sets in the west. It stays up all night long, reaching its highest point about midnight. In summer, it is as low in the sky as the sun is at noon in midwinter.
  5. 6. - is considered as the greatest of the early Greek astronomers who compared and observed the brightness of the 850 stars and arranged them into order of brightness or magnitude.
  6. 9. - planets moves in the opposite* direction for some time, after which it resume its eastward motion
  7. 10. - in the solar system is a large round object that orbits the sun and has cleared out most of the other objects in its orbit.
  8. 11. - the reddish planet, is the only other known body whose surface conditions seemed suitable for life of some kind. The Martian days and nights are about the same lengths as ours
  9. 12. - Earth is assumed to the center of all
  10. 16. - either of the two times in the year: the summer solstice and winte solstice
  11. 19. - was a studentor Plato. For him, the earth is spherical in shape since it always casts a curved shadow when it eclipses the moon.
  12. 20. - growing ; describes the moon when the illuminated portion is increasing
  13. 22. - is the second planet from the sun. It is brighter than Mercury in the sky and is easily seen near the sun at either sunup or sunset.
  14. 24. - astronomical model in which the Earth and planets revolve around the sun
  15. 29. - the sun and all of the planets, comets, etc. that revolve around it.
  16. 31. - proposed a system of fixed spheres. He believed that the sun, moon and the five known planets and the stars were attached to these spheres which carried the heavenly bodies while they revolved around the stationary Earth.