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earth is sphere
1) According to a 2008 paper in Applied Optics by David K. Lynch, the curvature of the earth becomes somewhat visible at an elevation of 35,000 feet (with a >60° field of view) and more easily visible at an elevation of 50,000 feet. So if you're on the right commercial flight, you might be able to see the curvature of the earth with your own two eyes
In the event that you're not high enough, though, you can still experience the curvature of the earth another way. For example, if you were to fly all the way around the world, you'd find that it would be nighttime in part of the world and daytime in another part. In that way, the existence of time zones itself is proof that the Earth is round.
Taken another way, you wouldn't even need to travel through different time zones. Time zones are wide enough that you will see the sun rising and/or setting later in the western part of a time zone than in the eastern part. According to the Farmers' Almanac, the sun will rise and set roughly four minutes later for every 70 miles you drive from east to west.
If you wanted to combine this experiment with the previous one, you could note how much more of Earth you can see when you begin your ascent into the air than you can while you are sitting on the tarmac waiting to take off.
2) Earth
It has liquid water, plate tectonics, and an atmosphere that shelters it from the worst of the sun's rays. But many scientists agree our planet's most special feature might just be us.
3)by latitude and longitude
4) A globe is a three-dimensional sphere used to represent the earth as a whole. It assists in the search for various nations and oceans. ... It shows the right shape, location and size of the earth's continents and oceans.
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