Monday, January 23, 2012

What do we call the time for the sun to make one complete circle on the zodiac?

What do we call the time for the sun to make one complete circle on the zodiac?



a. 1 year

b. a synodic year

c. one day

d. one monthWhat do we call the time for the sun to make one complete circle on the zodiac?
Of exclusively the above, the answer is A...1 year.


The correct and more specific answer is E. 1 sidereal year.What do we call the time for the sun to make one complete circle on the zodiac?
a. one year



As the Earth takes one year to make one complete revolution around the Sun, the apparent position of the Sun also takes the same length of time to make a complete circuit of the whole ecliptic. With slightly more than 365 days in the year, the Sun moves almost 1掳 eastwards every day.



The first point of Cancer and directly overhead on Earth on the tropic of Cancer so named because the Sun turns around in declination. Ecliptic longitude 180掳, right ascension 12 hours is reached around 22 September and marks the second equinox or first point of Libra. Due to perturbations to the Earth's orbit, the moment the real Sun passes the equator might be several minutes earlier or later. The southernmost declination of the sun is reached at ecliptic longitude 270掳, right ascension 18 hours at the first point of the sign of Capricorn around 21 December.

http://en.wikipedia.org/wiki/EclipticWhat do we call the time for the sun to make one complete circle on the zodiac?
B
A. One year

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