unit 3 vocab Part A

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Across
  1. 3. motion when a celestial body appears to be moving across the sky as the night passes.
  2. 4. The outer part of the Sun's atmosphere. The corona is visible from Earth during a total solar eclipse. It is the bright glow seen in most solar eclipse photos
  3. 6. when an object appears rounded on both sides
  4. 7. The model indicating that the Sun is the center of the solar system, and it is Earth and other planets that revolve around the Sun. Nicolaus Copernicus was the first person known to propose the heliocentric model (2 words)
  5. 8. The total or partial blocking of one object in space by another
  6. 10. One of two days of the year when the Sun's radiation crosses directly above Earth's equator. This day generally occurs on September 23rd of each year, and the number of daylight and nighttime hours are equal. (2 words)
  7. 11. the apparent change in the shape of the Moon as seen from Earth as it moves in orbit (2 words)
  8. 14. A mutual physical force of nature that causes two bodies to attract each other. Gravitational force increases with mass and close distances
Down
  1. 1. a phenomenon that occurs when Earth is directly between the Sun and the Moon, and the Moon passes into the shadow of Earth (2 words)
  2. 2. The model indicating that Earth is the center of the solar system, and it is the sun, stars, and other planets that revolve around Earth (2 words)
  3. 5. occurs when the earth is the farthest from the sun.
  4. 8. The two points at which the Sun's radiation crosses directly above Earth's equator in its yearly path in the sky. During an equinox, there are equal amounts of daytime hours and nighttime hours
  5. 9. The average time between successive new or full moons. A lunar month is equal to approximately 29.5 days. The completion of one lunar month is called a lunar cycle (2 words)
  6. 11. The interval of a complete cycle between one new Moon and the next. The lunar cycle is also equal to the lunar month of 29.5 days in length (2 words)
  7. 12. an imaginary line through the center if rotation of an object, axis of earth is at 23.5°
  8. 13. an oval shape in which Earth orbits the Sun and the Moon orbits Earth