Our solar system has eight plants revolving around the sun in fixed orbit.
Starting from the planet near to the sun the order is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Mercury is the planet nearest to the sun and Neptune is farthest from the sun. The picture expresses distance between the sun and planets in astronomical units (AU).One astronomical unit (AU) = 92,955,807 miles (149,597,871 km).
Answer
Mercury being the first plant of the solar system is the nearest planet to the sun.
In reality, the average distance from the Sun to Mercury is roughly 58,000,000 km (35,000,000 miles) or 0.4 AU.