How earth revolves around sun.

The Earth revolves around the Sun due to the gravitational force between the two, following an almost circular path called an *orbit*. This orbit is slightly elliptical, meaning Earth’s distance from the Sun varies slightly throughout the year.

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Here’s how it works:

1. **Gravitational Force**: The Sun, being much more massive than Earth, exerts a strong gravitational pull on Earth. This gravitational force is what keeps Earth from moving in a straight line out into space.

2. **Inertia**: Earth has its own forward momentum. This means that, without the Sun's gravitational pull, it would travel in a straight line. The combination of Earth's forward momentum and the gravitational pull from the Sun keeps Earth moving in an orbit around the Sun.

3. **Elliptical Orbit**: Earth's orbit around the Sun is elliptical (slightly oval-shaped). Earth is closest to the Sun around January (called *perihelion*) and farthest from the Sun around July (called *aphelion*).

4. **One-Year Revolution**: It takes Earth approximately 365.25 days to complete one full revolution around the Sun. This period, called a *year*, is why we have a leap year every four years to account for the extra 0.25 days.

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This balance between gravity and inertia creates a stable orbit, allowing Earth to maintain a steady distance from the Sun while traveling around it.