Selenelion: The Phenomenon Where The Sun and Moon Are Visible During a Total Lunar Eclipse

“The Sun and the Moon have been observed to appear in the sky at the same time during a total lunar eclipse. This cannot happen if the Earth is round because the Sun, Earth and Moon are supposed to be in a straight line during a total lunar eclipse. So, the globe Earth model is wrong!”

Some flat-Earthers observed the Sun and Moon appear at the same time during a total lunar eclipse. Predictably enough, they pick the most far-fetched explanation, and conclude the Earth is not round. But in reality, this phenomenon is well documented and clearly explained.

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Brightness of a Total Lunar Eclipse

“Looking at the pictures of the progression of a lunar eclipse, the Moon turns red, but there’s no apparent change of brightness of the Moon as it progresses from full moon to total eclipse. Therefore, a total lunar eclipse cannot be the result of the Earth casting its shadow on the surface of the Moon.”

Some flat-Earthers —presumably never seen a total lunar eclipse in person before— actually claim that.

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Lunar Phase and Lunar Eclipse

Apparently it is a very common misconception that the phases of the Moon is caused by the Earth’s shadow. Not only among flat-Earthers, but the general public as well. The difference is that flat-Earthers will usually jump to conclusion, and have some outlandish interpretation about this.

In reality, the phases of the Moon happen because we see a different sunlit part of the Moon at different time. Not because it is over the shadow of the Earth.

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Not to Scale: Depictions of the Solar System

Practically every depiction of the Sun, Earth and Moon is drawn not to scale. Flat-Earthers sometimes use this fact to point out the alleged “failure of modern science” to describe motion of celestial bodies, or something like that.

But in fact, the reason is simply that it is practically impossible to create a model of the solar system with real scale, using static images, that is still effectively describes the objects it is trying to explain.

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Flat-Earth Ideology and The Fallacy of Lonely Fact

Flat-Earthers often commit the fallacy of ‘hasty generalization’. They would draw the conclusion from limited sample that fail to represent the entire population. Sometimes they would even draw the conclusion from a single case, and it becomes the fallacy of ‘lonely fact’.

Furthermore, they would deliberately cherry-pick cases that support their position, and use those to disprove the other cases that are against their position.

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