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Astro Bob

Full Hunter’s Moon Sunday — Watch For The Moon Illusion

12 Oct 2019, 18:37 UTC
Full Hunter’s Moon Sunday — Watch For The Moon Illusion
(200 words excerpt, click title or image to see full post)

The full moon can appear outsized when it’s near the horizon. It’s an illusion likely caused by how our brains unconsciously compare the moon to familiar objects near it. Click the photo to find out when the moon rises for your city. Bob King
On Sunday evening get ready for the Full Hunter’s Moon. It will rise close to sunset, and depending on where watch, look larger than usual … or maybe not. Most people see a rising full moon as much larger than the same moon when it shines overhead. We know that’s physically impossible, and you can prove it by taking photos of the moon at both times. When you compare the images the moon’s size will be identical.
In fact, the moon at the horizon is actually about 4,000 miles (6,400 km) further away and 1.5 percent smaller compared to overhead. That’s because we have to look across half the planet to see it at moonrise. When it’s way up in the sky, it right above us (no Earth in the way) and 4,000 miles closer. Crazy, huh? Aristotle thought the atmosphere magnified the moon, but while it can change its color and bend its light, thicker ...

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