Later, as the months wear on, a series of additional messages arrive from Gerry -- always delivered in the most remarkable and surprising of ways. With each new message comes a new adventure, and each letter signs off in the same familiar way: P.S. I love you..
For a person standing at sea level, however, the horizon is only about 3 miles away. Lets do the calculations. The figure below shows an observer whose eyes are a distance E above sea level. A straight line drawn from the observers eyes tangent to the seas surface touches it at the distance d1, which is the distance to the horizon. If R is the radius of the earth, then, to first order in E/R, it is easy to show that.
On the surface of Earth (which is approximately spherical) if your eyeballs are 5â² 7â³ (1.70 m) off the ground, then the horizon is 2.9 miles (4.7 km) away. You should be able to see that far. Horizon - Wikipedia. If you are on an airless cube-shaped planet, then you can see to the end of the visible universe.