![]() When we see a bird flying, for example, it is closest to us when directly overhead, and gets further away as it flies towards the horizon.īut the Moon is much further away than a bird, so its distance from us doesn’t vary depending on its position in the sky (although its distance varies slightly month to month, that’s not relevant to this effect). This illusion is a trick our minds play on us, most likely because we instinctively think the Moon is further away when it is on the horizon. ![]() Measure the Moon at the horizon and then later in the evening when it’s higher, and its size doesn’t change. Of course, the Moon doesn’t really change size at all – you can prove this by making an “OK” sign with your thumb and forefinger and viewing the Moon through the hole, or simply by using your thumb to cover the Moon.
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