It means that the afternoon sun is at its fiercest, shining directly on the earth.
12:00 noon is the sun's greatest angle of altitude in a day, the strongest sunshine, but the highest temperature in a day is about 2:00 pm. This is because the rise and fall of temperature is determined by the relative magnitude of heat received and heat dissipated from the ground.
12:00 noon although the light is the strongest, just the surface of the highest amount of heat, but the total amount of heat received & gt; the total amount of heat dissipation, so the temperature will rise until about 2:00 p.m., the amount of heat received and the amount of heat dissipation is gradually equal to the temperature has reached the high limit of the day.
Extended informationTheoretically, the sun at noon is a little closer to us than in the morning and evening, but look but up smaller, which seems to be somewhat contradictory, in fact, there is some basic common sense, said to open up the not at all surprising.
But first of all, the sun looks like the size of the change and hot and cold changes, and the morning and noon this point of distance change has nothing to do.
The sun is 150 million kilometers away from us on average, and the diameter of the earth is only 12,756 kilometers, even if the difference is one earth's distance, it is only one part in 11,759. A difference of one ten thousandth of a percent you are able to see a change in the size of the sun? Not to mention that the morning sun and the noon sun is not a difference of one earth distance, at best, the difference in the radius of the earth, it is more than 20,000ths.
This little difference in distance does not affect the size of the sun we see, nor does it affect the temperature of the sun on the earth.