Answer:
Precession
Explanation:
Various stars will act as northern stars due to precession, as well as the stars and planets arrayed around the celestial equator (zodiac) will steadily change locations. Every 73 years, they move around one degree. For the remainder of our days, and for a few millennia later, Polaris would stay the North Star.
The position of a place north or south of the equator is described
in terms of its latitude. Since we're talking about the surface of
a sphere, latitude is an angle, and its value is given in angle
measure.
Any unit of angle is fine ... degrees, radians, grads, etc., and if
you're given an angle in one unit, you can always easily change
it to a unit that you like better ... but 'degrees' has been the unit
used most often for latitude, and longitude too, practically since
the whole system was invented a few hundred years ago.
For parts of an angle smaller than a whole degree, 1/60 of a
degree (minutes) and 1/3600 of a degree (seconds) were used
traditionally for the first couple hundred years. But that ponderous,
inconvenient system is rapidly giving way now to plain old decimal
degrees, probably because those are easier for the computer to handle.
The answer is D.
The theory of continental drift more or less states that the continents move apart, so in order of most 'together' is B, C, A. The answer that corresponds is D.
