Miss it and wait three years more！The Blue Moon makes its Friday debut
Last updated 2026-09-25 — Taipei Astronomical Museum stated on its official website that there were two full moons in July 2015, occurring at 10:20 on the 2nd and 18:43 on the 31st. According to common parlance, the second full moon within a month is...
By ／MOOK Scenic Spots Home Travel Life Network Editorial Department compiled and reported
Taipei Astronomical Museum stated on its official website that there were two full moons in July 2015, occurring at 10:20 on the 2nd and 18:43 on the 31st. According to common parlance, the second full moon within a month is called a “Blue Moon,” and if you miss this one, you’ll have to wait until 2018 to see another.
Blue Moon. (Image source ／esbtrib)
Although it’s called a Blue Moon, the moon isn’t actually blue. The term “Blue Moon” stems from a misunderstanding caused by an American astronomy magazine, Sky&Telescope, in 1946, referring to the second full moon in a month. The true origin of the term comes from the Old Farmer’s Almanac of Maine, USA, where the third full moon in a season with four full moons is called a Blue Moon.
The moonrise time on July 31 is 18:23. Those wishing to view the Blue Moon can look east-southeast at low altitude with the naked eye after 18:30. Choose a viewing spot where the eastern to southeastern horizon is unobstructed. As the moon will pass through its orbital perigee at 18:03 on August 2, and due to the “moon illusion” effect when viewing the moon shortly after moonrise, these two factors will make the Blue Moon appear larger than a typical full moon.
The moonrise time on July 31 is 18:23. Those wishing to view the Blue Moon can look east-southeast at low altitude with the naked eye after 18:30. Choose a viewing spot where the eastern to southeastern horizon is unobstructed. As the moon will pass through its orbital perigee at 18:03 on August 2, and due to the “moon illusion” effect when viewing the moon shortly after moonrise, these two factors will make the Blue Moon appear larger than a typical full moon.
The most beautiful in Japan: The astronomical & night cherry blossom spectacle “Lunar Eclipse and Cherry Blossom Viewing”
》http://www.mook.com.tw/article.php?op=articleinfo&articleid=11359
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