Angular resolution and Flat earth

The city of Chicago sunk vertically can be seen from the opposite shore 100km away.
Based on the curvature of the Earth, Chicago should be 800 meters below sea level and therefore invisible.The Earth is not a sphere.

angular resolution

Human eyesight has its limits. We cannot see indefinite far away, and there is a limit in distinguishing objects in the far away.

For example, the light from the headlights of a distant car appears as a single light. As the car gets closer, it becomes clear that there are two headlights.

Also, people with poor eyesight cannot tell which side of the C-ring on a vision test is open.

Whether you can see well depends on the visual angle of the pupil. It also is called the object's angular size. The ability to distinguish objects based on their visual angle is called angular resolution.

By increasing the angular resolution of the pupil or objective lens (widening the angular size), distant objects become clearer. To widen the viewing angle, you can view objects further away by looking from a higher position or by increasing the angular size of the objective lens.

Still, due to the properties of light, such as refraction, bending, and diffraction, maximum angular resolution is up to ➡ the optical horizon (radio horizon). We can't see any further than that.

The horizon determined by the angular resolution of your eyes or objective lens is the apparent horizon. By increasing the angular resolution (widening the viewing angle), you can see beyond the apparent horizon, but this only goes as far as the horizon of light (radio horizon).

When an image of a distant object is blocked at the bottom by the horizon of light (radio horizon), no matter how much you increase the angular resolution of the objective lens and zoom in, the image with the bottom blocked off will only be enlarged, and you will not be able to see anything beyond the horizon of light.

Airy disck

Because light has wave properties, light passing through a circular aperture, such as the pupil of an eye or the lens of a camera or telescope, diffracts and produces a concentric pattern of light and dark on the observation plane away from the aperture.

The brightest area in the center is called the "Airy disk," and it is surrounded by multiple concentric rings called the "Airy pattern." The disk and each ring are separated by dark concentric rings.

This phenomenon is named after George Biddell Airy, who explained it in 1835 in his book "On the Diffraction of Objective Lenses with Circular Apertures."

The angular resolution which represents the degree of distinguishing between objects determines how their Airy disks overlap.
If the viewing angle is large and the angular resolution is high, there will be no overlap of the Airy disks (overlap of light diffraction patterns), and distant light sources and objects can be clearly distinguished.

On the other hand, if the viewing angle is narrow and the angular resolution is low, the light diffraction patterns will overlap, making it impossible to distinguish between distant light sources or objects.

Physics - Optics: Circular Aperture - Angle of Resolution (6 of 6) Rayleigh's Criterion

The angular size (viewing angle) of our pupils or lenses for something far away, becomes smaller (narrower), and we cannot see it, but if we zoom in on the camera to increase the angular size, we can see it again.

The limit of the pupil's viewing angle creates the apparent horizon, but by zooming in on the camera to increase the viewing angle (angular size), thus improve angular resolution, we can see objects beyond the "apparent horizon."

The radio horizon is about 100 km away depending on atmospheric conditions, so we can see as far as the radio horizon, beyond the "apparent horizon" due to angular resolution.

Angular resolution experiment with a coin on a flat table

Standing a coin on a flat table and move it from one end of the table to the other to see how it appears as the viewing angle (angular resolution) changes.

Distant objects on a flat surface become invisible because the viewing angle (angular resolution) becomes smaller; you can see distant objects by increasing the viewing angle (zooming in).

The camera's zoom-in function is effective up to the radio horizon, and beyond that, simply you can enlarge an image cut off below the radio horizon, you can not see anything further.

Globe Earth - 20th Century Propaganda

Many people today believe that the Earth is a sphere due to brainwashing through school education, newspapers, TV news, and other media.

The idea that the Earth is a sphere is one of the propaganda of the 20th century.
This idea, along with other propaganda such as evolution and the universe, have created a world that denies God (the creator of heaven and earth).
The theories of the earth, the universe, and evolution are lies that are inconsistent with the Bible.

The reason why ships heading out to sea gradually disappear from view is not because the earth is curved.
This is an optical phenomenon that occurs when a person's angular size (angular resolution) becomes smaller (narrower) as the ship moves away from them on level seas.

Our view is blocked by the "apparent horizon" determined by the angular size (angular resolution), but by zooming in with cameras, the viewing angle can be widened, thus we can see beyond the apparent horizon.

Still, the limit is as far as the radio horizon caused by the refraction of light.
The radio horizon blocks the bottom of the object, making it appear to sink vertically.

The reason why objects appear to sink vertically on the radio horizon is not because the earth is curved. If it is curved, the object will not appear to sink vertically, but rather tilted in the direction of the curve. In reality, everything appears to sink vertically.