How far is horizon at sea level for a six foot person?

The formula for calculating the distance to the horizon for a given height of an observer is:

```

Distance to the horizon (in miles) = sqrt(7.35 * (height of observer in feet))

```

For a six foot person, the height of the observer is 6 feet. Plugging this value into the formula, we get:

```

Distance to the horizon (in miles) = sqrt(7.35 * (6)) ≈ 2.77 miles

```

Therefore, the horizon is approximately 2.77 miles away for a six foot person at sea level.