NASA has teamed up with Western Kentucky University to develop an app to track April’s solar eclipse on a cell phone. The SunSketcher app makes it easy for volunteers to record the event so scientists can compile the photos into a database in an effort to map the sun. Just before the eclipse, users within its path of totality from Texas to Maine on April 8 simply need to put their phone on the stand or tripod, face their back camera to the eclipse.