'A' and 'C' are the same point in time. When Summer ends, Autumn begins. An equinox occurs at that time.
The position of the Earth represents an equinox are A and C.
Equinox means both of the twice every year (as about March 21 and September 23) when the Sun crosses the equator and day in and day out are wherever on earth of around equivalent length.
The end of summer and the beginning of autumn occurs at the same point in time. When Summer ends, Autumn starts. An equinox occurs at this time.
Thus, the correct option are A and C.
Learn more about equinox.
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