Congress passed the Achieving a Better Life Experience Act on the final hour of the final day of Congress in December, creating a new type of tax-advantaged account called an ABLE account or a 529A. The hope is that ABLE accounts will help level the financial playing field for families raising kids with disabilities.
Since there are 360 degrees in a circle, this angle is about is about 1/7930 of the circumference of the circle. And the circle in question, the earth, has an average circumference of 40,041,470 meters. Dividing by 7930 results in 5048.88 meters, or a little over 5 kilometers. Remember, however, that this is based on an assumed height of 2 meters, which is very tall for a human. A shorter person would not be able to see as far; a taller person could see farther. But there are diminishing returns. For example, a 4 meter-tall person can't see twice as far as a 2-meter-tall person, but a 1-meter-tall person can see more than half as far as a 2-meter-tall person. Or...
People with good eyesight, on a clear night, can see the Pinwheel galaxy, and that's about 27 million light years away. That's the most distant thing I know of that can be seen with the naked human eye. Vision is constrained by how clear the air is, and how much light is reflected or emitted by the object being viewed.