(Portland, OR) -- If the weather cooperates, you'll be able to see a lunar eclipse early Tuesday morning. A lunar eclipse is when the moon passes through the earth's shadow. The moon turns red, which is why it's called a Blood Moon. The total eclipse starts at 3:04 a.m., the greatest eclipse is at 3:33 a.m. and the total eclipse ends at 4:02 a.m. Unlike a solar eclipse, a lunar eclipse is safe to view. The next total lunar eclipse visible in the Northwest is in 2029, and it'll occur during the day.