Impressive points about Blue Moon

Blue moon, an interesting astronomical phenomenon will take place tonight. So what is this mysterious phenomenon? Is the moon really green?

Like 'Sieu Trang ' , Trang Xanh is a rare phenomenon about Ms. Hang, but is less well known by public opinion. Here are the things to know about this full moon phenomenon.

What is blue moon?

Mr. Dang Vu Tuan Son, Vietnam Young Astronomical Association said: The blue moon of the season refers to the third full moon of four full moon times of a season . According to this calculation, there will be a green moon every 3 years. The last time was on August 20, 2013 and the next time was May 21, 2016. The blue moon of the month refers to the second full moon in the solar month.

As we all know the moon cycle is 29.53 days. So for months with 30 or 31 days if the full moon falls on the 1st, the 30th or 31st of that month will repeat this phase of the Moon. The second full moon of the month will be called the Blue Moon. The green moon of the month is more likely to occur than the blue moon of the season, about 2.5 years will appear once.

Combining both of these two definitions, there is one full moon every 1 year counted as Blue Moon.

Columbia's Blue Moon (USA) - (Photo: Missourian)

Interesting things about

It is not really blue: In fact, the name Blue Moon has nothing to do with the color of the moon. At some point, the full moon may be light red.

There are two definitions of the Blue Moon: The term Blue Moon was originally set for the third full moon in a total of 4 moon seasons, but after having made a mistake in the Sky & Telescope magazine in 1943, it brought another meaning. The article in the magazine defines false Blue Moon as the second full moon in a month, but unfortunately this definition lasts until today.

Blue Moon has many names: Today, the full moon is also known by the names such as Full Moon Sturgeon Day, Moon Blue Corn, Moon Moon and Red Full Moon . Each full moon name in August is named The tradition of North American aboriginals and Europeans.

The moon is only round for a moment: Although the moon appears round on the night before and after, but technically, it is only round for a short time, not for long.