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Rare black moon appears in the sky on August 23

The new moon on August 23 is a seasonal "black moon." This is a rare phenomenon that occurs every 33 months. People will have the opportunity to admire the beautiful night sky.

Báo Khoa học và Đời sốngBáo Khoa học và Đời sống21/08/2025

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At exactly 2:06 a.m. EST (local time), the moon will enter its new moon phase, a phenomenon that occurs every 29.5 days. This new moon is also known as a "black moon." Photo: Adventure_Photo via Getty Images.
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A new moon occurs when the Moon passes between the Earth and the Sun, making the Moon's surface invisible from Earth. A black moon is the opposite of a blue moon and is just as rare. Like blue moons, there are two types of black moons. Photo: NASA Goddard.
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According to Time and Date, a new moon can be called a black moon if it is the second new moon in the same calendar month. This can happen when a new moon occurs on or around the first or second day of a month. Photo: Karl Tate/Space.com.
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Then, there will definitely be a second new moon later that month. This is called a monthly black moon, which occurs approximately every 29 months. The next monthly black moon will occur on August 31, 2027. Photo: Alasdair Turner via Getty Images.
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However, astronomers also use the term “black moon” to refer to the third new moon in a season with four new moons. This strange phenomenon is exactly what is happening on August 23, and it’s all because the new moon appears right after the summer solstice or spring equinox. Photo: Getty Images.
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It is currently summer in the Northern Hemisphere and winter in the Southern Hemisphere, starting with the summer solstice on June 20 or 21 (depending on your time zone) and ending with the spring equinox on September 22. Photo: Pexels.
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During this time, there are new moons on June 25 (just four days after the summer solstice), July 24, August 23, and September 21 (one day before the spring equinox). This is a fairly tight window, but still enough for four new moons to appear in one summer. Photo: Pexels.
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The third new moon (on August 23) is called a seasonal “black moon.” This new moon occurs about once every 33 months, making it a little rarer than the monthly black moon. Photo: Pexels.
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Although the black moon is not visible to the naked eye, this time of year presents a unique opportunity for stargazers. On that day, astronomy enthusiasts will have a perfect moonless night to view the summer stars when the Milky Way is at its best from the Northern Hemisphere. Photo: Pexels.
Readers are invited to watch the video : Universe map with more than 900,000 stars, galaxies and black holes. Source: THĐT1.

Source: https://khoahocdoisong.vn/trang-den-hiem-gap-xuat-hien-ngay-238-tren-bau-troi-post2149047272.html


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