* The length of day and night is equal ... Autumn will start from this evening *
September 22, 2020, not only is the length of day and night equal, but autumn will also begin in the northern hemisphere at 6:30 pm, Pakistan Standard Time. This happens every year and this occasion is called "Autumnal Equinox". At the same time, however, spring will begin in the southern hemisphere.
From an astronomical point of view, the seasons change every year in four stages:
* First: * Vernal Equinox, also called astronomically "beginning of spring". On this day night and day are equal in length. This year, the occasion came on March 20 at 8:49 a.m. Pakistan time.
* Second: * Summer solstice which is called the starting point of spring on earth. It is the longest day of the year and the shortest night. The occasion came at 4:43 a.m. on June 21 this year.
* Third: * Autumnal Equinox, meaning "the beginning of autumn", the details of which are described at the beginning of this news.
* Fourth: * Winter Solstice when the longest night of the year and the shortest day. In astronomy, this time is also called the beginning of winter. This year's Winter Revolution will take place on December 21 at 3:01 pm PST.
"Moderation" are the occasions when the sun passes through the celestial equator, while "revolutions" are the occasions when the sun moves on its annual path (the solar system) from the celestial equator. Goes a long way.
As mentioned earlier, the weather in the northern hemisphere is the opposite of what it is in the southern hemisphere. (That is why in the month of January, when it is getting cold in Pakistan and other northern countries, it is very hot in Australia and New Zealand.)
In view of this, they are now called "Moderation of March, Revolution of June, Moderation of September and Revolution of December" respectively.
* Our planet Earth is tilted 23.45 degrees on its axis, due to which there are four seasons in the whole year, namely cold, summer, autumn and spring. Due to this inclination, the weather in the northern hemisphere is the exact opposite of the weather in the southern hemisphere