Prime vertical

Okay, imagine you're standing outside and looking up at the sky. You know that the sky keeps changing as the Earth rotates around the sun. The prime vertical is an imaginary line that helps astronomers and scientists find different stars and planets in the sky.

The prime vertical is a line that runs from due east to due west and goes right through the zenith (the point directly above your head). It divides the sky into two halves: the eastern hemisphere and the western hemisphere.

So, whenever you want to find a particular star or planet in the sky, you need to know its coordinates (kind of like an address in the sky). And if you know its coordinates, you can use the prime vertical to locate it in the sky.

For example, if you know that a particular star is located at 30 degrees north and 60 degrees east, you would use the prime vertical to find it. You would first find where the prime vertical intersects with the horizon, and then measure 60 degrees east of that intersection point. Then you would measure 30 degrees north of the horizon, and that's where the star would be located in the sky.

So, in summary, the prime vertical is like an imaginary treasure map that helps scientists and astronomers find different stars and planets in the sky. It runs from east to west and goes through the zenith, and it helps us locate objects in the sky based on their specific coordinates.