When you look out over an unobstructed landscape or seascape, the distance to the visible horizon depends on your height above the ground.
To determine the distance to the visible horizon, you can use the concept of the Earth's curvature. The formula to calculate the distance to the visible horizon is:
d = √(2Rh)
Where:
d is the distance to the visible horizon
R is the radius of the Earth
h is your height above the ground
The radius of the Earth is approximately 6,371 kilometers (3,959 miles), but keep in mind that this value varies slightly depending on your location.
To use this formula, you need to know your height above the ground. For example, if you are standing at sea level with no elevation, your height would be 0. If you are on top of a hill or a building, you would measure your height from the ground to your eye level.
Let's say your height is 2 meters (6.5 feet). Plugging in the values into the formula:
d = √(2 * 6371 km * 0.002 km)
d ≈ 4.5 km
Therefore, if you are 2 meters above the ground, the distance to the visible horizon would be approximately 4.5 kilometers.