Use Figure 21

Essay

Use Figure 21.26 below to help explain the difference between the sidereal and synodic month.
In the second position the Moon has moved to the other side of Earth and it says "day 14 ^¾ full Moon". In the thi position the Moon is back on the Sun's side of the Moon. It is labeled "day 27 ^¼ Earth, Moon and distant star are once again aligned Siderelal month. and then a second Moon 2 days separated from the first that says "day 29
^½, new Moon synodic month.. The angle to distant star is now upward.