The moon is growing larger and will be full by Saturday, May 21.
It will also be a blue moon.
The most common definition for a blue moon is a second full moon occurring in a calendar month.
Along similar lines, most years have 12 full moons. About every three years there is a 13th full moon. The extra full moon is called a blue moon.
Most seasons (spring, summer, fall, and winter) have three full moons. Occasionally, there will be four full moons in a season. The third full moon is called a blue moon.
The full moon Saturday is the third full moon this spring (the others being March 23, April 21, and June 20).
To view the blue moon on Saturday, look toward the southeast at 10 p.m. The moon will be 27 degrees above the horizon.
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Six degrees to the right (south) of the moon is Mars which is becoming very bright. Mars is at opposition on Sunday night (on the opposite side of the Earth from the sun) and is at relatively close approach to the Earth and visible most of the night.
Also Saturday, Saturn will be 8 degrees below the moon toward the horizon. These stellar wonders are close to the bright red star Antares “the rival of Mars” at the heart of Scorpius the Scorpion. Judge for yourself whether Antares rivals Mars when Mars is at its best.
