The horizon is determined as the apparent line where the sky meets the ground, observable when viewed from a position close to the surface of a planet or celestial body.
Understanding the Horizon
Based on observations made close to a celestial body's surface, like being a human on Earth, the horizon is perceived as the seeming division between the sky and ground.
How it Appears on Earth
For an observer standing on the Earth's surface, this horizon line is created by the visual effect of seeing the curvature of the globe as it appears to meet the sky.
In essence:
- It's a visual phenomenon.
- It requires being close to the surface of a body.
- On a curved surface like Earth, it's directly linked to the perspective of seeing the planet's curve meeting the sky.
Consider these points:
- The horizon is not a fixed physical line in space.
- Its position can change slightly based on observer height and local terrain.
- It's primarily a function of the observer's location relative to the curved surface of a large object like a planet.
