Make sure you accept location services — this is how the app will know where you are and correctly orient the night sky.
The screen will show you what's visible right now in the night sky. To see a future view, click the time and date box.
Change the date and time to whenever you plan on watching the eclipse. On the US East Coast, totality begins at 10:11 p.m. EDT, peaks around 10:47 p.m. EDT, and goes until 11:23 p.m. EDT.
Use TimeAndDate.com to find the exact time for your region.
For New York, we entered 22:11, which is 10:11 p.m. EDT in military time, and the start of totality.
Once you enter the time of the lunar eclipse, move your phone around until the moon appears on the screen.
Collapse the date-and-time menu. Where you're holding up your phone is where you'll see the moon — and the total lunar eclipse.
Can't see the eclipse in person? The online observatory Slooh will stream a live broadcast starting at 8 p.m. EDT, below.
Should that feed not work for any reason, NASA is also streaming video of the eclipse beginning at 8 p.m. EDT.
While you wait for the lunar eclipse to start...
Learn why a lunar eclipse makes the moon appear red, what a supermoon is, and why it will make the event appear larger and brighter than normal.
We've also rounded up some tips on how to photograph the total lunar eclipse during your night under the stars.
Are you taking photos of the 'super' blood moon?
We'd love to share your shots! Please email your favorite highest-resolution images to ti-science@techinsider.io with a full credit, a link to your site or profile (if you'd like), and explicit permission for us to use your work.