The elliptical shape of the Earth's orbit varies with time and takes about ____ to complete a ...

The elliptical shape of the Earth's orbit varies with time and takes about ____ to complete a cycle. This is a factor in the Milankovitch theory of ice ages.
 
  a. 24 hours
  b. one year
  c. 26 years
  d. 260 years
  e. 100,000 years

Question 2

The inclination of the axis of the Earth varies from 22 to 24 degrees taking ____ to complete a cycle. This is a factor in the Milankovitch hypothesis of ice ages.
 
  a. 24 hours
  b. 1 year
  c. 499 years
  d. 41,000 years
  e. Wrong The Earth's axis tilt is fixed at exactly 23.50 with no variation whatsoever.

Question 3

At the time of the winter solstice (the start of winter) the sunlight is at a lower angle and thus is ____ than(as) in the start of summer in the northern hemisphere.
 
  a. less intense
  b. more intense
  c. the same intensity

Question 4

At the time of the winter solstice (the start of winter), the Sun is
 
  a. farthest south of the celestial equator.
  b. farthest north of the celestial equator.
  c. on the celestial equator moving north.
  d. on the celestial equator moving south.