Question

Direct rays of the sun fall on the equator ?
(A) 21 march
(B) 21 june
(C) 22 december
(D) None of these

Answer 1

Hint:Our earth is tilted toward the sun so the whole earth experiences equal days and equal nights is called an equinox. On 21st march and 23rd september directed rays of the sun fell on the equator. These days are very hot in the year.

Complete answer: The autumn equinox is primarily associated with the arrival of fall in our minds, it is actually determined by a very specific astronomical event, not by the hitting of the weather. The equinox occurs when the "subsoiler point" - the place on Earth where the sun is directly overhead - lands exactly on the equator of our planet. It happens only twice a year, once in March (spring equinox) and once in September (fall at equinox). This was the second time in 2014 (for the second time) on 22 September Eastern Time; In 2015 it happened on September 23 at 4:21 am (EDT). At that time, the Earth was positioned in such a way that its axis was neither inclined towards the sun nor far away.
 It is the 23-degree inclination of the Earth that gives us the weather; Now, as the Earth continues to move in its elliptical path around the Sun, the Northern Hemisphere will begin to point farther and farther from the Sun, while the southern half of the planet gets more and more light. Days in the north become shorter and shorter until they reach their minimum at the winter solstice (which arrives on the east coast at 6:03 pm on 21 December).
  You might think that the position of the Earth in its orbit around the Sun may play a role in the time of the equinox - but it really is not! The perihelion, the point at which our planet is closest to the Sun, occurs in early January; It does not coincide with the equinox or solstice. In fact, on Earth, it is in melancholy, cooler than the Earth, the orbital point away from the Sun. This is mainly due to the fact that the Northern Hemisphere has more land than the Southern Hemisphere. The land heats up more easily than water, but is tilted away from the Sun, located in half of our planet. When the northern hemisphere is tilted toward the sun, easily warming land masses raise the world's average temperature.
In addition, residents of the Northern Hemisphere may be grateful that their spring and summer occur when the Earth strikes; Planets move slower than the Sun at points in their orbit, so seasons are not of equal length. The time between the spring equinox (from the northern point of view) and summer solstice, and summer solstice and autumn equinox, are 92.8 and 93.6 days, respectively; The time between the autumn equinox and winter solstice is just 89.8 days, and just 89 days between the winter solstice and the spring equinox. So the Northerners enjoy a slightly shorter autumn and winter than the residents of the Southern Hemisphere and now spring and summer.

So option A is the correct answer.

Note - Although "equinox" is Latin for "equal night", neither the spring nor the equinox coincide with the day and night which are exactly 12 hours long. Why not? Well, first off, the length of day on the same date naturally varies at different latitudes - the locations on the equator will always be near night and the same length. But there are other factors that cause the same day and night to actually arrive slightly later than the autumn equinox (even at the equator). Sunlight is folded by the Earth's atmosphere, so the sun always rises slightly more than it actually does. And while sunrise and sunset are determined when the edge of the sun crosses the horizon, the equinox is marked by the position of the center of the sun. These little dynasties do not keep the date of equinox at the end with the meaning of their name.