"Look east on the night of December 4 and you will see the final supermoon of 2025. Supermoons occur when a full moon coincides with the moon's closest approach to Earth, known as the moon's perigee. The moon then appears up to 10% larger and much brighter than usual. On December 4, 2025, the moon will be around 17,000 miles (around 27,300 kilometers) closer to Earth. This supermoon is also known as a "cold" full moon because it marks the start of colder, darker months ahead."
"A 'moon illusion' on the horizon If skies are clear, the moon may appear larger than it usually does as it rises over the horizon. But to most people, the difference will be indiscernible. However, when the moon does appear to be larger, it is due to what is known as a moon illusion a strange phenomenon for which there is little scientific explanation."
"You may also see a yellow tinge to the moon, visible as it rises over the horizon. This happens because light reflected by the moon at the horizon travels a greater distance to reach our eyes, compared to when the moon appears higher in the sky. The longer path for the light means short, blue wavelengths scatter, leaving predominantly red wavelengths that reach our eyes. As the moon rises in the sky, and the distance for the light to travel reduces, the moon appears to be bluer in color."
A supermoon will occur on the night of December 4, 2025 when a full moon coincides with the Moon's perigee, making it appear up to 10% larger and much brighter. The Moon will be roughly 17,000 miles (about 27,300 kilometers) closer to Earth. That full moon is called a "cold" full moon, marking the onset of colder, darker months. A horizon moon illusion can make the Moon seem larger even though most people find the difference indiscernible. A yellow or red tinge at rise results from scattering of blue wavelengths; the Moon appears bluer as it climbs higher.
Read at www.dw.com
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