Tonight is your last chance to see a Blue Moon until 2020

The partial lunar eclipse of a 'blue moon'

Don't miss the blue moon this Saturday- even if it's standing alone without a dream in your heart. LUIS ROBAYO | AFP | Getty Images

When two full moons appear in one month, which happens about once every 2.7 years, the second is christened the "Blue Moon".

Full moons themselves are not rare, as they occur nearly every 29 days, but a blue moon is a rare event.

The last time we had a Blue Paschal Moon was in 1999.

Wasn't there another full moon in March?

Unlike the "worm moon", the " blue moon" will reach peak fullness early in the morning at approximately 8:37 a.m. ET on March 31.

The March Blue Moon, dubbed by some Native American tribes the 'Sap Moon, ' coincides with this year's Easter weekend, which also makes it a Paschal Moon. See the Moon Phase Calendar for your city/state. The moon circles Earth every 27 days, but the geometry of the positioning of the Earth, sun and moon is the same every 29.5 days. Unfortunately, there won't be a gorgeous robin's-egg orb in the sky the night before Easter (PSA: Easter is this Sunday), just a typical, pearly grey full moon. According to the current definition, the term refers to the second full moon in a given calendar month.

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March blue moon will also be a "Paschal" moon - the first full moon since the vernal equinox, which signals the beginning of spring. Firstly, it is the last blue moon until Halloween 2020.

The Blue Moon from March has something special: it can be considered "Paschal".

It is possible for the full moon to have a blue hue, but it's not likely. But it has to do with atmospheric conditions - not calendar time. But, in 1883, the moon appeared bluish when the volcano Krakatoa in Indonesia erupted.

This quite rare celestial event - two blue moons occurring so close to each other - is not without some poetic symmetry. The January Blue Moon was also a supermoon, and it occurred during a total lunar eclipse. The Blue Moon was the third full moon during a season that had four full moons. This year, January had two full moons. It is one of the super moons.

Star and moon gazing fans should take note. You can watch the webcast directly from Slooh here.

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