قالب وردپرس درنا توس
Home / Science / It used to be a blue moon: a rare phenomenon is expected in the night sky on Saturday

It used to be a blue moon: a rare phenomenon is expected in the night sky on Saturday



On Saturday night, Democrats who are eager for a blue wave on election day may choose to skyward the sign: a blue moon.

The blue moon is usually defined as the second full moon in a month, but it is rare and arrives every two to three years. According to Earthsky.org, the last time occurred on March 31, 2018.

Confusingly, the older definition of blue moon refers to one-third of the four full moons in a season, because the season usually lasts three months, so one full moon is more than expected. The next such seasonal blue moon will arrive on August 22, 2021

.

Even more confusing is that the full moon in October is often called the “hunter’s moon.” However, although the first full moon of this month is on October 1, it is a “harvest moon”. According to Astronomy.com, this is “the name reserved for the full moon closest to the autumn vernal equinox,” which means that the harvested moon is usually seen in September.

Those hoping for a dramatic Halloween ghost may be disappointed on Saturday, because the term “blue moon” does not mean color. The Washington Post pointed out that the cynic’s depreciation of the Blue Moon is “visually inconspicuous pedestrian”, almost like other full moons.

In other words, sometimes the moon turns blue-coincident with volcanic eruptions. According to “Post”, in 1883, the Krakatau volcano erupted so much “volcanic aerosol” material into the sky that it “scattered a certain wavelength of light, causing the moon to emit a faint aquamarine on the edge.” “. The blue moon occurred in other volcanic eruptions, such as El Chichon in Mexico in 1983.

On Saturday, Earthsky.org provided comfort to all disappointed gazelles and pointed out that Mars will glow “bright red” near the blue moon.


Source link