“Planet Earth reaches its most distant point from the sun for 2012 on July 4, at 10 p.m. Central Daylight Time in the U.S. (July 5 at 3 UTC). By Universal Time, that’s July 5, at 3 in the morning.
Astronomers call this farthest point aphelion, and, at aphelion we’re about three million miles farther from the sun than we will be six months from now.”
polar mesospheric clouds (via Polar Mesospheric Clouds, Northern Hemisphere : Image of the Day)
What is the transit of Venus? (by PhysicsWorldTV)