FLAT Earth Disproved:
Aristotle noticed that during lunar eclipses (when the Earth's orbit places it directly between the Sun and the Moon, creating a shadow in the process), the shadow on the Moon's surface is round. This shadow is the Earth's, and it's a great clue on the...
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FLAT Earth Disproved:
Aristotle noticed that during lunar eclipses (when the Earth's orbit places it directly between the Sun and the Moon, creating a shadow in the process), the shadow on the Moon's surface is round. This shadow is the Earth's, and it's a great clue on the spherical shape of the Earth.
Ships and the Horizon
If you've been next to a port lately, or just strolled down a beach and stared off vacantly into the horizon, you might have, perhaps, noticed a very interesting phenomenon: approaching ships do not just “appear” out of the horizon (like they should have if the world was flat), but rather emerge from beneath the sea.
But – you say – ships do not submerge and rise up again as they approach our view (except in “Pirates of the Caribbean”, but we are hereby assuming that was a fictitious movie). The reason ships appear as if they “emerge from the waves” is because the world is not flat: it's round.
Varying Star Constellations
This observation was originally made by Aristotle (384-322 BCE), who declared the Earth was round judging from the different constellations one sees while moving away from the equator.
Shadows and Sticks
If you stick a stick in the (sticky) ground, it will produce a shadow. The shadow moves as time passes (which is the principle for ancient Shadow Clocks). If the world had been flat, then two sticks in different locations would produce the same shadow:
Seeing Farther from Higher
Standing in a flat plateau, you look ahead of you towards the horizon. You strain your eyes, then take out your favorite binoculars and stare through them, as far as your eyes (with the help of the binocular lenses) can see.
Then, you climb up the closest tree – the higher the better, just be careful not to drop those binoculars and break their lenses. You then look again, strain your eyes, stare through the binoculars out to the horizon.
The higher up you are the farther you will see. Usually, we tend to relate this to Earthly obstacles, like the fact we have houses or other trees obstructing our vision on the ground, and climbing upwards we have a clear view, but that's not the true reason. Even if you would have a completely clear plateau with no obstacles between you and the horizon, you would see much farther from greater height than you would on the ground
Ride a Plane
If you've ever taken a trip out of the country, specifically long-destination trips, you could notice two interesting facts about planes and the Earth:
1. Planes can travel in a relatively straight line a very long time and not fall off any edges. They can also circle the Earth without stopping.
2. If you look out the window on a trans-Atlantic flight, you can, most of the times, see the curvature of the earth in the horizon. The best view of the curvature used to be on the Concorde, but that plane's long gone. I can't wait seeing the pictures from the new plane by “Virgin Galactic” – the horizon should look absolutely curved, as it actually is from a distance.
Look at Other Planets
The Earth is different from other planets, that much is true. After all, we have life, and we haven't found any other planets with life (yet). However, there are certain characteristics all planets have, and it will be quite logical to assume that if all planets behave a certain way, or show certain characteristics – specifically if those planets are in different places or were created under different circumstances – our planet is the same.
The Existence of Timezones
The time in New York, at the moment these words are written, is 12:00pm. The sun is in the middle of the sky (though it's hard to see with the current cloud coverage). In Beijing, it's 12:00am, midnight, and the sun is nowhere to be found. In Adelaide, Australia, it is 1:30am. More than 13 hours ahead. There, the sunset is long gone – so much so, that it's soon going to rise up again in the beginning of a new da
Images from Space
In the past 60 years of space exploration, we've launched satellites, probes, and people to space. Some of them got back, some of them still float through the solar system (and almost beyond it) and transmit amazing images over to our receivers on Earth. And in all of the photos, the Earth is (wait for it) spherical.