The solar constant is the same for the area of the sun's sphere (4πr²) as for the area is its circle (πr²) Author; Rogelio Perez C Abstract The amount of energy that comes from the sun to the earth is measured with a solar constant. Which has a value of 1364w/m², this energy is the radiation emission value of the sun for the area of a sphere 4 π r², at the distance of an area of a sphere 4 π r² of an astronomical unit, as the earth only receives sunlight the area of a circle π r², then 4 parts of that energy are not reaching the earth, so the value of the constant is divided by four, to know how much energy emitted from the sun enters the earth, but this work shows that the value of the solar constant does not change when we measure the energy emitted by the sun, in an area of the solar circle ( π r²), between the value of the area of a circle ( π r²), of an astronomical unit, which is the area that looks to the earth, so the division of the solar constant ...