All the following statements are true. Which one explains the reason that there is not a solar eclipse at every new moon?
A) The orbital plane of the Moon is tilted slightly (by about 5 degrees) to the ecliptic plane.
B) The Moon goes through a complete cycle of phases about every 29 1/2 days.
C) The nodes of the moon's orbit precess with an 18-year period.
D) The Moon is only about 1/4 as large as Earth in diameter.
Answer: A