| A. Summer Solstice???? | 1. March 21 |
| B. Winter Solstice??? | 2. September 23 |
| C. Vernal Equinox????? | 3. December 22 |
| D. Autumnal Equinox?? | 4. June 22 |
A) A-1?????? B-2?????? C-3?????? D-4
B) A-4?????? B-3?????? C-1?????? D-2
C) A-2?????? B-3?????? C-1?????? D-4
D) A-3?????? B-2?????? C-4?????? D-1
Correct Answer: B
Solution :
?During the course of its revolution, the earth passes through four different phases and occupies four different positions. Two of them are known as solstices and the other two are called equinoxes. Solstices are the extreme positions when the earth's axis leans at maximum angle of \[23{{{\scriptstyle{}^{1}/{}_{2}}}^{o}}\]towards the sun. There are two solstices known as summer solstice and winter solstice. Summer solstice occurs on June 21 or 22 when the North Pole has maximum leaning towards the sun and the sun's says are vertical at the Tropic of cancer. Winter solstice occurs on December 21 or 22 when the South Pole has maximum leaning towards the sun and the sun's says are vertical over the tropic of Capricorn. Equinoxes' are two positions when neither of the two poles is tilted towards the sun and the sun's vertical noon rays strike the earth at the equator. The duration of day and night is exactly the same, being 12 hours, at all the parallels. This explains the word equinox, from Latin acquus, equal and nox, night. This is the reason that both the equinoxes are treated jointly. However, they are named differently. The equinox of March 21 or 22 is called the Vernal or spring equinox and that of September 22 or 23 is known as the autumnal equinox.
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