The July full moon illusion is one of those events that encourage people to look upwards in the sky. Many sky watchers notice something unusual during moonrise in every summer. Suddenly moon appears to be larger than normal near the horizon. But this is not the truth. The moon isn’t increasing its size; this is only due to July full moon illusion. Mostly the human brain produces this illusion. The size of the moon always remains the same, but the human brain interprets it differently depending on its location (where it appears) in the sky. This astronomical and psychological effect makes people confuse generation after generation.

Many sky watchers wait for this beautiful view the whole year. Watching a massive orange moon behind the tall buildings, trees, and mountains almost feels unreal. Images of the large moonrise instantly go viral on social media. Every year, July full moon illusion makes us realize how night sky events still surprise us.

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Why the Moon Looks So Huge Near the Horizon

To understand July full moon illusion, the most important thing is that the moon does not change its size suddenly. If scientists measure the size of the moon during rise time and after the night, the difference is negligible. So, why does this happen? The moon feels larger than normal to us.

This answer has more to do with human perception than astronomy.

When the moon appears near the horizon, our brains automatically start comparing it with other objects around it. Like trees, buildings, mountains, and houses, it creates some visual reference points that make the moon bigger in our thoughts. And when the moon appears higher in the sky, there are no other objects by which we can compare it. The moon is only surrounded by darkness, which makes our brain interpret it as smaller than its normal size. This effect is known as the moon illusion, and scientists have been studying it for many decades. After this much studying, still scientists debate about the exact psychological process behind this illusion. But most of the experts believe the human depth perception plays a major role in July full moon illusion. In summer the evenings are warm, and the atmospheric conditions create a deep orange color and soft light near the horizon during moonrise. This combination makes the view even more beautiful and peaceful. So that July full moon illusion becomes especially noticeable.

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Why July Full Moon Feels Different

Many people say that the moon feels bigger than its normal size during summer. So there are some reasons behind this July full moon illusion.

One of the biggest reasons is atmospheric conditions. During the summer season, the winds are warm, and the atmosphere contains humidity, haze, and dust. Due to these pollution particles, light scatters differently compared to other seasons. That’s why the moon takes on an orange and pale golden color soon after the moonrise. These colors grab the human attention easily.

The summer timing also matters. In July, people spend more time outside under the sky. Like on the beach, in the park, on the roof, and at outdoor gatherings. This increases the chance to view the moon rise. So it is said that July full moon illusion feels more memorable than other moon rises in other seasons.

The moon on the horizon also feels different. That means it feels closer to us and connected to the ground. While the moon which appears higher in the sky, feels like floating alone around the darkness. This close connection with the summer moon makes us feel that the moon appears bigger than its normal size.

Why the Human Brain Creates Such Illusions

For many decades scientists have been trying to find the exact reason why the human brain creates such illusions. They conclude to reason that it happens because the human brain processes visual information in very complex ways.

Scientists proposed a theory called the “apparent distant theory.” According to this theory, the human brain thinks the sky near the horizon is farther than the sky above us. So when the moon appears near the horizon, it means near the trees, buildings, or mountains. Our brain automatically starts comparing it with the earth’s object. Our brain believes the horizon sky is farther away, so it also assumes that the moon is larger than normal. And when the moon appears higher in the sky with no objects to be compared, our brain thinks it is smaller than normal, even though the moon’s size always remains the same.

Till now this theory is the most accurate explanation of the July full moon illusion. It shows how easily human perception can be influenced by the context. Millions of people feel the same illusion every year.

A Summer Sky Event That Never Gets Old

The July full moon illusion does not involve any massive explosions, black holes, or any distant galaxy mysteries. But still it is one of the most captivating visual events in the night sky. To enjoy this beautiful event, you don’t need any special telescope or any advanced instrument. You can just simply enjoy it with your naked eyes. In today’s modern era, where people spend most of their time looking down at a screen, this event gives you the opportunity to get close to nature. This event reminds us that even the familiar objects, like the moon, can also inspire us with wonder. As the next July full moon illusion is coming. Millions of people experience the same strange feeling while looking up at the sky.