Where the true horizon is obscured by trees, buildings, mountains or whatever, the resulting intersection of earth and sky is called the visible horizon.
See link for pictorial representation
horizon
6.23 miles
"Circumpolar" means it is always above the horizon.
There are many things that horizon A and horizon B could form. These things include slopes and lines for example.
There are many things that horizon A and horizon B could form. These things include slopes and lines for example.
As they sailed on, there was a visible light at the horizon.
The horizon. It is the apparent line that separates the Earth from the sky, and it is visible when looking out towards the distance.
Waning Crescent
The visible apparent edge of a body (like a planet or asteroid).
the waning crescent
The sun sets behind the horizon.
Photosphere is the visible surface of the sun, appearing as a bright disk or "sphere" when observed from Earth. It is always visible during the day when the sun is above the horizon.