Before revision: The subsolar point on a planet is the point at which its sun is perceived to be directly overhead (at the zenith); that is, where the sun 's rays strike the planet exactly perpendicular to its surface.
After revision: The subsolar point on a planet is the point at which its Sun is perceived to be directly overhead (at the zenith); that is, where the Sun 's rays strike the planet exactly perpendicular to its surface.