That would be Earth's Moon, 'Luna'.
Earth is the third planet from the sun in our solar system.
the object that is nearest to earth is moon
The Earth
Venus is the most similar solar system object to Earth in terms of mass and density. Venus has a mass of about 81.5% that of Earth and a density of about 94.5% that of Earth.
The Moon.
The Sun is the object in the center of the heliocentric solar system. It is a star around which all the planets, including Earth, orbit.
Mercury
The only natural object we know of that does that is the earth's moon.
Everything else in the solar system would orbit the earth instead of the sun. And it would take months to fly from London to Australia :)
The Moon. After that, it could be Venus or Mars, depending on their orbits. The distance between the Earth and Mars/ Venus changes.
Earth is a planet in the solar system
'Geo' comes from the Greek for Earth e.g. Geometry means measuring the Earth; Geology means reading the Earth (rocks), Geography means writing about the Earth. So a geocentric solar system has Earth at the centre.