In the wee hours of Tuesday morning, the first of four "blood moon" total lunar eclipses will occur, with the three others following at six month intervals. On the East Coast of the US, the eclipse can be observed starting around 2AM if weather permits. The name 'blood moon' refers to a reddish color that appears due to atmospheric effects. You can also watch the event live on the Slooh community telescope webcast. More info at Space.com.
Pictured: Lunar eclipse from February 21, 2008, as seen over Sofia, Bulgaria.