Weekend full moon biggest in about 20 years
If the moon looks a little bit bigger and brighter this weekend, there's a reason for that. It is.

Saturday's full moon will be a super "perigee moon" -- the biggest in almost 20 years. This celestial event is far rarer than the famed blue moon, which happens once about every two-and-a-half years.

"The last full moon so big and close to Earth occurred in March of 1993," said Geoff Chester with the U.S. Naval Observatory in Washington. "I'd say it's worth a look."

Full moons look different because of the elliptical shape of the moon's orbit. When it's at perigee, the moon is about 31,000 miles (50,000 km) closer to Earth than when it's at the farthest point of its orbit, also known as apogee.

Full Worm Moon – March... As the temperature begins to warm and the ground begins to thaw, earthworm casts appear, heralding the return of the robins. The more northern tribes knew this Moon as the Full Crow Moon, when the cawing of crows signaled the end of winter; or the Full Crust Moon, because the snow cover becomes crusted from thawing by day and freezing at night. The Full Sap Moon, marking the time of tapping maple trees, is another variation. To the settlers, it was also known as the Lenten Moon, and was considered to be the last full Moon of winter.