D) Accepting an hypothesis doesn\'t require experiment 18. Most ancient cultures
ID: 287595 • Letter: D
Question
D) Accepting an hypothesis doesn't require experiment 18. Most ancient cultures made the sky. B) no observations of the sky C) organized observations of the sky. D) more news about the sky. 19. The sidereal day is the time it takes the Earth A) to rotate since before it starts rotating B) to rotate relative to the Sun. C) to rotate around the Sun D) to rotate relative to the back ground stars. 20. The ecliptie is A) It is the apparent path of the Sun in the sky. B) It is inclined 180° relative to the Celestial Equator. C) It crosses the Celestial Equator at the Summer and Winter Solstice. D) the apparent path of the Mars. 21. The time interval from one full or new Moon to the next is called, A) Sidereal Month B) Solar Month C) Helio Month D) Synodic Month 22. When do Astronomers start the Solar Year A) June 21 B) January 1 C) March 21 D) September 23 23. The average time interval between successive passages of the Sun across the celestial meridian is called A) The Sidereal Day B) The Solar Day C) The Mean Solar Day D) The Synodic Day 24. Do Stars remain fixed relative to each other as the move from east to west? A) Yes B) No 25. What does the Moon do in one Synodic month? A) Cycles through a Lunar eclipse. B) Cycles through its phases.Explanation / Answer
18) - -(A). unorganised observation of the sky as these mesopotamians, greeks etc did not have the telescopes to perform organised observations
19).-- (D). to rotate relative to the back stars because it represents the time taken by the earth to rotate on its axis relative to the stars, and is almost four minutes shorter than the solar day because of the earth's orbital motion.
20).-- (E) it is apparent path of the sun in sky, it is a great circle on the celestial sphere representing the sun's apparent path during the year, so called because lunar and solar eclipses can only occur when the moon crosses it.
21).-- (D) A lunation or synodic month is the average time from one new moon to the next
22).-- (C) 21 march,The rules used to compute the date of Easter used a conventional date for the vernal equinox (March 21), and it was considered important to keep March 21 close to the actual equinox
23). --(C) Mean Solar Day, the time between successive passages of the mean sun across the meridia
24).--(A) YES
25).--(B)Synodic month is the period of the lunar phases, because the Moon's appearance depends on the position of the Moon with respect to the Sun as seen from the Earth.
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