Lesson 10 Flat Earth Interactive Calculator
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Lesson 10 Flat Earth Interactive Calculator

Important Flat Earth versus Globe Earth Information

THIS IS HELPFUL TO READ: This Flat Earth versus Spherical Earth calculation tool enables you to experiment with various real-world scenario models. Use this tool to see how well a Flat Earth or a Spherical Earth Model matches with what you actually see in real life.
PLEASE NOTE: Regardless of Flat or Spherical Earth, most real-world scenario figures do not show up well in the models shown below due to the fact that Earth is very large relative to the following three factors: building/object heights, your eye height above water, and the distance between you and any object.
Most real-world differences in elevation will show up as only a single pixel if it’s a large enough amount to even invoke a single pixel. Your ability to see elevation differences in the models below will partly depend upon the size and resolution of your screen and the zoom level you set the below models to. However, the description for each scenario model does give you actual numbers accurate to real-world scale which should offer enough information for you to draw your own accurate conclusions.
There is no description data provided here for Flat Earth Models because the numbers are the same regarding your eye height, tower/object height, and distance in both flat and spherical models. The remaining numbers are not relevant due to the fact that in any flat earth model you will always see the entire object no matter how low or how high you’re viewing it from.
Flat Earth Expectations: With any Flat Earth scenario, you as the observer should always be able to see an entire object no matter how far away it is provided that you are viewing it over a of relatively calm body water and the air is clear and reasonably dry.
Spherical Earth Expectations: With any Spherical Earth scenario, if the object is at a greater distance than your water horizon, then you as the observer should always have a diminishing view of any object as your distance from the object increases. These experiments work best when viewing over a relatively calm body of water and the air is clear and reasonably dry. The closer your eyes get to water level then the more atmospheric distortion you will experience.
4 Sample Scenarios: Four example scenario buttons below have been added. Some of these examples correspond with pictures that are shown in Lesson 9. “Chicago” views the John Hancock building. “Sheboygan” views the 525-foot power plant smokestacks. “Two Rivers” views the breakwater pier. “Exaggerated” is an example that is greatly exaggerated to better show differences between Flat and Spherical Earth models.
AN IMPORTANT POINT TO UNDERSTAND: In both “Exaggerated” examples, the object and the distance between the eye and the object are the same, however, the Eye Height is different. Take note of the difference in Line-Of-Sight height at the object’s location between the two Exaggerated models.
. . . Show More

When using the Water Horizon Calculators below

Fill in or select the appropriate values.
Show decimal place(s).

Red Globe Water Horizon Calculator - A

If my eyes are
above the water, then my water horizon is
0.0
away from where I am standing.
And if a tower is just over
tall, I can see only the very top of it
away from where I am standing.
No
LineOfSightA

Green Globe Water Horizon Calculator - B

If my eyes are
above the water, then my water horizon is
0.0
away from where I am standing.
And if a tower is
tall and the tower is
from my eyes,

Exaggerated Globe Earth Model

E
T
WH
E
T
WH

Exaggerated Flat Earth Model

E
T
E
T
Summary of Lesson 10
If you happen to be near a large body of water, if the Earth is a globe, you should be able to detect curvature by looking at very tall items near the shore. For instance, if you are twenty or thirty miles out on the water on a ship, and you look to the shore, you should only be able to see the upper portion of very tall structures like the Chicago skyline etc. However, if the Earth is flat then no matter how far away you are from the structure, you should be able to see the lower part of the structure as well. What do you see?
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