Here's a breakdown:
* Horizon: The line where the sky appears to meet the Earth.
* Rising: The movement of a celestial object (like a star) from below the horizon to above it.
As the Earth rotates, the apparent position of stars in the sky changes. When a star is below the horizon, it is not visible. As the Earth rotates, the star moves higher in the sky, eventually crossing the horizon and becoming visible. This is what we call the star "rising."
