NASA is launching an app so anyone can track and document the solar eclipse that's coming next month.
The space agency is inviting people to become what it calls "citizen scientists" when the total solar eclipse happens on April 21st.
All you need is a smartphpone and a thermometer. People everywhere in North America will see at least a partial eclipse.
You can download the app here. After downloading the app and registering yourself, the app will guide you in recording your observations.