On every day of the year, the Sun strikes one part of the Earth at normal incidence, and another part at grazing incidence. (Clouds excepted).
The angle the sun's rays hit a given surface on Earth.And the angle is measured from the horizon up to the position of the sun
The cosine law states that it is when the sun's rays hit at 90 degrees to the surface - this is also "normal" to the surface/perpendicular to the surface. Simple terms? When the sun is "overhead".
if there was no tilt we would not have any seasons because no part of earth would be tilted toward the sun.:))))))
It is the angle at which the sun's rays hit the earth
The Sun's rays can hit Earth's surface at a right angle to the surface, depending on the season, anywhere between the tropics (i.e., between 23.5 degrees north and 23.5 degrees south), at noon, when the Sun is highest in the sky.
If the sun's rays hit the Earth's surface at a direct spot, which is usually around the equator, that area would be the warmest. Any area that is far away from the sun's rays is usually cold.
it affects the angle at which the sun rays hit the earth
The higher in the sky the sun is the more solar radiation received at the surface. This is because as the sun gets higher in the sky, there is less atmosphere blocking the sun's rays. Imagine the sun going through the atmosphere at a 90 degree angle. The thickness of the atmosphere let say is x thick. As the sun hit the surface at a lower angle, the thickness of the atmosphere has to go through more atmosphere to get to the surface. So the thicker atmosphere blocks more of the sun's rays.
LEss than a 45 degree angle
the sun
If the sun's rays hit the Earth's surface at a direct spot, which is usually around the equator, that area would be the warmest. Any area that is far away from the sun's rays is usually cold.
The sun’s rays hit the surface directly.