Happy π Day. Π? π? I go with π, since that’s what this is all about, anyway. right?
Well, you know, to our American friends. Never mind. Dumb joke. Predictable. Happy π Day to each and every one of you around the world and throughout the Universe.
On a related note, NASA proudly recalls the Pi Transfer:
On Jan. 19, 2007, the Cassini spacecraft took this view of Saturn and its rings—the visible documentation of a technique called a “pi transfer” completed with a Titan flyby. A pi transfer uses the gravity of Saturn’s largest moon, Titan, to alter the orbit of the Cassini spacecraft so it can gain different perspectives on Saturn and achieve a wide variety of science objectives. During a pi transfer, Cassini flies by Titan at opposite sides of its orbit about Saturn (i.e., Titan’s orbital position differs by pi radians between the two flybys) and uses Titan’s gravity to change its orbital perspective on the ringed planet.
Taking in the rings in their entirety was the focus of this particular imaging sequence. Therefore, the camera exposure times were just right to capture the dark-side of its rings, but longer than that required to properly expose the globe of sunlit Saturn. Consequently, the sunlit half of the planet is overexposed.
Yeah. They can do this. Happy π Day.