The Cassini space craft will be taking mosaic images of Saturn tomorrow and Earth will fall in the back ground. NASA and JPL are asking everyone to step outside tomorrow between 5:27 p.m. to 5:42 p.m. Eastern Daylight Time, 2:27 p.m. to 2:42 p.m. Pacific Standard Time and wave low on the eastern horizon and photo bomb Saturn!
More about it here.Wondering how you can participate when Cassini takes a picture of Earth and its moon on July 19, 2013? I've put together some charts so you know where to look for Saturn at your part of the Earth.
Cassini's image of Earth will be just 1.5 pixels wide, with the illuminated part of Earth less than a pixel, so the resulting mosaic will not actually show people or the continents. But if you are on the sunlit side of Earth at the time – North America and part of the Atlantic Ocean -- you are in the picture. The western part of Africa and Europe will also be facing Cassini's cameras, but they will be dark.
For those in the U.S., step outside (or stay inside) and wave low on your eastern horizon (southeast in the central and eastern U.S.) as Cassini’s cameras take a series of pictures over about 15 minutes in the afternoon of July 19 from 2:27 to 2:42 p.m. PDT (21:27 to 21:42 UTC).