In astronomy zenith (the point in the sky exactly above you) is the point most distant from the horizon. As a horizon defines how far down the sky you can look, zenith defines how high up you can look.
a horizon
Panorama does not have an antonym. However, the word "Panorama" is used to describe a long distance view with a wide horizon, as might be seen in an open landscape, and the word "Vista" is a long distance view with a limited horizon, as in looking down an avenue of trees. So, vista is a kind of antonym of panorama.
There's not a single cloud on the horizon. The expiration of the loan loomed like a dark cloud on their company's horizon.
it means that it goes to the horizon because the horizon looks like it meets the sky
atmosphere
It would take approximately 360 moons placed next to each other to extend from one point on the horizon to the point directly opposite on the horizon, assuming each moon is the same size as Earth's moon.
The altitude of the highest point of the rainbow that you see is (42 degrees) minus (the altitude of the sun above the horizon behind you). If the sun is sitting right on the horizon ... just risen or just about to set ... then the highest point of the rainbow is about 42 degrees above the horizon opposite the sun. If the sun is higher, then the rainbow is lower, by the same amount. If the sun is more than about 42 degrees above the horizon, then any rainbow you might otherwise see is entirely below the opposite horizon, and you don't see one.
The star is considered rising. Also, it is setting when it is the opposite (moving from above the horizon to below.)
Dawn is the beginning of morning twilight.
a horizon
Lunar effects the tide to rise. The moon has its own gravity that rises the sea water. Water sips through the tunnel like holes from horizon to opposite horizon hence collecting more water on the side where the moon is facing.
the horizon that contains topsoil is the A HORIZON
on
Horizon B's name is Horizon Brave.
horizon A , horizon B and horizon C
the answer is horizon
The "boundary" you're probably thinking of is called the event horizon. Past this point, the escape velocity of the black hole exceeds the speed of light, meaning nothing, including light, can escape it.