General Knowledge - Basic General Knowledge - Discussion

Nice, Thanks all.

At the time of sunrise and sunset, the light from the sun has to travel the longest distance of atmosphere to reach the observer. Since the red light of long wavelength so it is scattered a little, while blue light of short wavelength thus it is scattered more. So blue light is much lost than red light. Thus blue light is almost absent in sunlight reaching observer and only red light reaches us. As a result, the sun and it's region seem to appear red. That's why the sun glows red.

Thanks @Gaurav.

Why the sun glows red?

Please describe the reason.

There is No revolution & no season.

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 than the other, and this exposure alternates as the Earth revolves in its orbit. For approximately half of the year(from around March 20 to around September 22) , the northern hemisphere tips toward the Sun, with the maximum amount occurring on about June 21. For the other half of the year, the same happens, but in the southern hemisphere instead of the northern, with the maximum around December 21. The two instants when the Sun is directly overhead at the Equator are the equinoxes. Also at that moment, both the North Pole and the South Pole of the Earth are just on the terminator, and hence day and night are equally divided between the northern and southern hemispheres. At the March equinox, the northern hemisphere will be experiencing spring as the hours of daylight increase, and the southern hemisphere is experiencing autumn as daylight hours shorten.

The effect of axial tilt is observable as the change in day length and altitude of the Sun at noon(the culmination of the Sun) during a year. The low angle of Sun during the winter months means that incoming rays of solar radiation is spread over a larger area of the Earth's surface, so the light received is more indirect and of lower intensity. Lower intensity light is less able to heat the ground. Between this effect and the shorter daylight hours, the axial tilt of the Earth accounts for most of the seasonal variation in climate in both hemispheres.

It is because of the earth's tilt that one hemisphere experiences summer while the other experiences winter.

When tilted, the hemisphere closer to the sun would experience summer, while the hemisphere that is relatively farther away would experience winter.

If the earth were not tilted, the whole planet would be relatively equidistant from the sun, and hence, no seasons.

Well. The earth would remain static if its not on the Earth's Orbit so its not revolving.

So no change in seasons.

Please give the explanation. !

Why? please explain.