A polder is a They are important because they are used at barriers to the nether lands.
Answer:
B. The time for one complete revolution of the earth relative to the celestial reference.
Explanation:
As a sidereal day is about 23 hr 56 min and 4.09 seconds so, this makes a sidereal day approx 365.24 (86,164.1) seconds. Compared to solar time which is 4 minutes longer than a sidereal day. Thus about the celestial bodies, time is taken for one complete revolution. Its is easier to point a telescope to the proper coordinate in the night sky.
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3 congruent angles means the triangle is congruent too. as the angles are 60 degrees, the sides are congruent as well