Same as for any other planet, the point where if you were standing there the sun would be directly overhead. Or are you asking for the point in space where Mercury reaches perihelion? The longitude of perihelion is 77.45645 degrees. This is measured from the first point in Ares, which is where the sun is at vernal equinox (on Earth).
Mercury rotates (slowly) as it orbits the Sun. So, the point that's closest to the Sun changes with time.
Mercury's axial tilt is pretty much zero, so the surface point closest to the sun will always be on the equator, at the point directly facing the sun (which changes with Mercury's rotation and orbit).
The planet Mercury is closest to the sun, at about three-tenths Earth's distance at the nearest point in its orbit.
Mercury is the closest to the sun.
Mercury is the planet closest to the sun.
Mercury is the closest planet to our sun.
The planet Mercury is closest to the sun, at about three-tenths Earth's distance at the nearest point in its orbit.
Mercury is closest to the sun
Mercury is the closest planet to our sun. Its also the smallest.
Mercury is the closest planet to the sun
No. The planet closest to the Sun is Mercury.
Mercury is closest to the sun.