• A total lunar eclipse, or 'blood moon,' will be visible across the entire U.S. this Tuesday morning.
• Observers on the East Coast have a chance to see a rare selenelion, where the sun and eclipsed moon are visible simultaneously.
• The eclipse begins with a partial phase at 4:50 a.m. ET, reaching totality at 6:04 a.m. ET, with the moon turning reddish for 58 minutes.