please answer all of the questions
Answers
Answer:
(I) Days and nights are equal at all places on earth on March 21 because on this day sun rays will fall in the vertical direction towards the equator or at the center position of the earth. This supplies the equal light distribution from pole to pole which makes the day and night duration same.
(ii) Regardless of the time of year, the northern and southern hemispheres always experience opposite seasons. This is because during summer or winter, one part of the planet is more directly exposed to the rays of the Sun (see Fig. 1) than the other, and this exposure alternates as the Earth revolves in its orbit.
(iii) To keep in tune with the Earth's orbit, the calendar needs to keep adding February 29 from time to time. A calendar is meant to correspond to the Earth's seasons. The year 2020 is a 'leap year', meaning the month of February will have 29 days instead of 28, and the total number of days will be 366 instead of 365.
(iv) The Earth orbits the sun once every 365 days and rotates about its axis once every 24 hours. Day and night are due to the Earth rotating on its axis, not its orbiting around the sun.