How far can you see on the horizon?

The distance to the horizon depends on the height of the observer's eyes above the surface of the Earth. The formula to calculate the distance to the horizon is given by:

$$d = \sqrt{2Rh}$$

Here:

- \(d\) is the distance to the horizon in kilometers.

- \(R\) is the radius of the Earth (approximately 6371 km).

- \(h\) is the height of the observer's eyes above the surface of the Earth in meters.

For example, if an observer is standing on the ground with their eyes 1.8 meters above the surface, the distance to the horizon would be:

$$d = \sqrt{2 \times 6371 \times 1.8} km = 4.7 km$$

So, an observer standing on the ground with their eyes 1.8 meters above the surface would be able to see about 4.7 kilometers to the horizon.