Stage set tonight for longest lunar eclipse since the 1400s

The longest partial lunar eclipse in nearly 600 years will grace the night sky late Thursday night and early Friday across the entire country, weather permitting.

According to NASA, the eclipse will last three hours and 28 minutes, the longest partial eclipse of this century and the longest in 580 years.

For East Coast observers, the partial eclipse begins a little after 2 a.m. Friday and reaches its maximum at 4 in the morning. For observers on the West Coast, it begins just after 11 p.m. Thursday and reaches a maximum at 1 a.m. Friday.