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Online 240B

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What Is a Blue Moon and When Is the Next One? [tonight]
« on: October 31, 2020, 07:32:54 pm »
timeanddate.com
By Vigdis Hocken and Aparna Kher
Saturday, October 31, 2020

On Saturday, October 31, 2020—Halloween, in many countries—a Blue Moon will shine bright in the night sky. This Halloween Blue Moon, which is also a Micro Full Moon, is October's second Full Moon in many time zones.

What Is a Blue Moon?
There are two different definitions for a Blue Moon. A seasonal Blue Moon is the third Full Moon of an astronomical season that has four Full Moons. A monthly Blue Moon is the second Full Moon in a calendar month with two Full Moons.

The Full Moon on October 31, 2020 is a monthly Blue Moon. October's first Full Moon, and this year's Harvest Moon, was on October 1, 2020.

...

How Rare Is a Blue Moon?
For a monthly Blue Moon to take place, a Full Moon must occur at the beginning of the month. This is because the time between two successive Full Moons is approximately 29.5 days, just short of most months in the Gregorian Calendar.

Seasonal Blue Moons take place slightly less frequently than monthly Blue Moons—in the 1100 years between 1550 and 2650, there are 408 seasonal Blue Moons and 456 monthly Blue Moons. This means that either type of Blue Moon occurs roughly every two or three years.

Blue Moons that are blue are incredibly rare and have nothing to do with the calendar or the Moon's phases but are instead a result of atmospheric conditions. Volcanic ashes and smoke, water droplets in the air, or certain types of clouds can all contribute to a Full Moon taking on a blue shade on rare occasions.

Double Blue Moon
Because of this, February, which has 28 days in a Common Year and 29 days in a Leap Year, can never have a monthly Blue Moon. Some years, February has no Full Moon at all, which is called a Black Moon. A February with no Full Moon happens when January and March have a Blue Moon each.

Known as a Double Blue Moon, this phenomenon is rather uncommon and takes place only about three to five times in a century. We saw a Double Blue Moon in 2018 in most time zones and will see it again 19 years later, in 2037, in many time zones.

...

(more)
https://www.timeanddate.com/astronomy/moon/blue-moon.html
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Offline Gefn

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Re: What Is a Blue Moon and When Is the Next One? [tonight]
« Reply #1 on: October 31, 2020, 07:41:01 pm »
It’s a song by Sha Na Na.

No, seriously, thanks for the post @240B



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« Last Edit: October 31, 2020, 07:42:07 pm by Gefn »
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Re: What Is a Blue Moon and When Is the Next One? [tonight]
« Reply #2 on: October 31, 2020, 07:42:20 pm »
Tonight is a full moon and a blue moon ....SPOOKY!
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Re: What Is a Blue Moon and When Is the Next One? [tonight]
« Reply #3 on: October 31, 2020, 09:44:21 pm »
Blue Moon is the beer I buy by the keg for the Castle bar when I can't get Shock Top.
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Re: What Is a Blue Moon and When Is the Next One? [tonight]
« Reply #4 on: October 31, 2020, 09:50:53 pm »
Quote from: Cyber Liberty on October 31, 2020, 09:44:21 pm
Blue Moon is the beer I buy by the keg for the Castle bar when I can't get Shock Top.

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Re: What Is a Blue Moon and When Is the Next One? [tonight]
« Reply #5 on: October 31, 2020, 09:53:28 pm »
Blue Moon ---...hmmm..... which brings to mind the song....


www.youtube.com/watch?v=8eMkH0s3Vpc
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I Believe in the United States of America as a Government of the people, by the people, for the people; whose just powers are derived from the consent of the governed; a democracy in a republic; a sovereign nation of many sovereign states; a perfect union one and inseparable; established upon those principles of freedom, equality, justice and humanity for which American patriots sacrificed their lives and fortunes.  I therefore believe it is my duty to my country to love it; to support its Constitution; to obey its laws to respect its flag; and to defend it against all enemies.
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