The gravitational force between the Sun and Earth is primarily responsible for Earth's revolution around the Sun. This gravitational force acts as the centripetal force that keeps Earth in its elliptical orbit. The Sun's immense gravitational pull exerts an inward force on Earth, causing it to move in a curved path around the Sun.

As Earth revolves around the Sun, its velocity is constantly changing due to the variation in its distance from the Sun. According to Kepler's laws of planetary motion, Earth's orbital velocity is highest when it is closest to the Sun (at perihelion) and lowest when it is farthest from the Sun (at aphelion). This variation in velocity is also influenced by the Sun's gravitational force.

The gravitational force between the Sun and Earth is inversely proportional to the square of the distance between their centers. This means that as Earth moves closer to the Sun during its orbit, the gravitational force becomes stronger, causing Earth's orbital speed to increase. Conversely, as Earth moves farther from the Sun, the gravitational force weakens, leading to a decrease in orbital speed.

In summary, the Sun's gravity plays a crucial role in determining Earth's revolution around the Sun. It acts as the centripetal force that keeps Earth in its orbit and influences the planet's orbital speed throughout its journey around the Sun.