In honor of Earth Day, April 22, NASA will make amazing Earth views available with an event highlighting imagery taken by astronauts and the science behind it. From NASA... For the first time ever, NASA Television will air a special hour-long broadcast of views of Earth taken in High Definition, or HD, by astronauts on past space shuttle and International Space Station missions.
The special HD broadcast will air between 6 a.m. and 8 a.m. EDT on Friday, April 18, and replay at the same time on Monday, April 21. It will air every hour from 6 a.m. to 8 p.m. on Tuesday, April 22. See http://www.nasa.gov/ntv