Biology Forums - Study Force

Precession of the rotation axis of Earth is caused by
 
  a. the force of gravity from the sun and moon on Earth's equatorial bulge.
  b. the force of gravity from the sun and Jupiter on the Earth-moon system.
  c. the magnetic field of Earth.
  d. the formation and subsequent melting of glaciers during the ice-ages.
  e. the impact of asteroids.

Question 2

The Big Dipper is
 
  a. a circumpolar constellation for southern hemisphere observers.
  b. always on an observer's zenith.
  c. an asterism.
  d. only visible from the southern hemisphere.
  e. a constellation.

Question 3

A(n) __________________ is one-3,600th of a degree.
 
  a. precession
  b. second of arc
  c. minute of arc
  d. nadir
  e. angular diameter

Question 4

An observer's nadir is
 
  a. the point directly opposite the observer's zenith.
  b. the north point on the observer's horizon.
  c. located at the center of Earth.
  d. always located near a circumpolar constellation.
  e. directly opposite the north celestial pole.

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I hope they're paying you for this because all of them were correct :lol:

not really, just a volunteer... and you're welcome ;)