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How much dimmer is the light on Saturn than earth Watch

1. Just wondering does anyone know how much dimmer the suns light is on Saturn than earth, an equation would be great if anyone knows one.
2. (Original post by SamRob85)
Just wondering does anyone know how much dimmer the suns light is on Saturn than earth, an equation would be great if anyone knows one.
Intensity = Power/Area
The area is the area of the sphere given by 4pi*r2
r in this case is the distance from the sun to the point you are interested in.
Remember SI units
Wikipedia will have the values for power I imagine
3. LOL i think is 1365039004x dimmer than the light on earth
4. (Original post by SamRob85)
LOL i think is 1365039004x dimmer than the light on earth
The distance from the Sun to Saturn is about 9.5 times the distance of the Sun to the Earth.

The intensity of the light, as joostan says, is proportional to the inverse square of the distance.

So, to give you a clue, if it was proportional to just the inverse of the distance (not square) the intensity would be 1/9.5 on Saturn, compared with Earth.
But as it depends on the (inverse) square, it would be...
?
5. So its 1/90.25 of the intensity of the light on earth?
6. (Original post by SamRob85)
So its 1/90.25 of the intensity of the light on earth?
Yes 9.52 is the factor by which it is reduced.

If you look up a table of planetary data (loads if you Google it) and find the distance of a planet from the Sun in AU (Astronomical Units, Earth=1) you will see the value for Saturn is about 9.5AU.

From this you can do the same calculation for any of the other planets.
7. (Original post by Stonebridge)
Yes 9.52 is the factor by which it is reduced.

If you look up a table of planetary data (loads if you Google it) and find the distance of a planet from the Sun in AU (Astronomical Units, Earth=1) you will see the value for Saturn is about 9.5AU.

From this you can do the same calculation for any of the other planets.
Thanks so much for the help

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