A.The days on which the sun shines vertically over the tropics
B.The phenomenon which occurs in a Leap Year
C.The period when the sun shines vertically over the Equator at noon
D.The dates on which days and nights are exactly equal
A.The days on which the sun shines vertically over the tropics
B.The phenomenon which occurs in a Leap Year
C.The period when the sun shines vertically over the Equator at noon
D.The dates on which days and nights are exactly equal