How much sunlight does Neptune get?
Neptune, the planet that is the farthest known of the solar
system, if you discount Pluto, is located 30.047 times farther away
from the Sun than Earth is, at 2,793,100,000 miles, while earth is
93,000,000 miles from the Sun. Only about one thousandth of the
Sunlight received by Earth reaches Neptune. Yet, with that small
amount of sunlight the atmosphere of Neptune is significantly
affected. To sum this up, Neptune only gets about 1/900 the
sunlight of earth.