You may know that for a fact. Physicists who have experimented with it would disagree. Candlelight max distance with perfect conditions about 1.6 miles.
Interesting.
From my personal experience, as well as studies from other knowledgeable people (http://www.livescience.com/33895-human-eye.html), “On a dark night, you could even see a candle flame flickering up to 30 mi. (48 km) away.”