The full moon of this weekend is not an old moon, it will be a blue moon, according to NASA.
But no, it does not actually exist to be blue.
It turns out that there are two ways to have a blue moon.
The best-known definition of the blue moon is to have two full moons in one calendar month, the second being called the blue moon.
According to NASA, what happens on average for every 2.5 years.
But another way to define a blue moon is the third full moon in a season with four full moons. That definition takes place in 1528, and that is the one used for the full moon of this weekend.
The astronomical spring (on the northern hemisphere) runs from the spring equinox on March 20 to the summer solstice on June 21.
During that time frame there will be four full moons:
1. March 20 (worm moonlight)
April 2, 19 (pink moon)
3. May 18 (flower moon and blue moon)
4. June 17 (strawberry moon)
Because the strawberry moon comes in front of a solar cell that makes four full moons during the spring. It also makes a full moon on the Saturday blue moon.
According to EarthSky astronomers, the last seasonal blue moon was May 21, 2016.
The moon will reach 100 percent full on Saturday afternoon at 4.12 am. CDT, according to NASA, but will appear completely from Friday night through the weekend.
There are several other nicknames in the moon's full moon.
The Indians used their own names for the moon full moon, according to Farman's Almanac, who first began publishing names in the 1930s.
The full moon in May was also called a moon, a moon for planting a plow and a milk moon.
The next blue moon will fall on Halloween in 2020, according to the National Meteorological Service.
There there were moons that actually appeared blue, but they are rare. One of the better-known examples was in 1883, when the Indonesian volcano Krakatoa broke out, blowing tons of ash high in the atmosphere.
The particles making up the ash were small enough to disperse the red light and allow other colors to shine, according to NASA – making the moon appear blue.
The blue moon was observed for years after the eruption.
The blue colored moons have also been observed recently following volcanic eruptions – including St. Helens in the state of Washington in 1980. Forest fires can produce the same effect.
The moon rose at 6:35 am. CDT Friday in Birmingham and will be held at 5:46 am on Saturday. It will rise again at 7:40. Saturday evening and set at 6:27 on Sunday. The last month of the weekend will increase at 8:42 am. Sunday. Click here to see the time in your area.