Earth's orbit is not a perfect circle because of the gravitational pull of other planets and objects in our solar system. The shape of an orbit is affected by the distribution of mass in the system, and the combined gravitational forces of the sun, moon, and other planets pull on Earth, causing its orbit to be slightly elliptical instead of circular.
The elliptical shape of Earth's orbit plays a crucial role in the changing of seasons. When Earth is closest to the sun (perihelion), it experiences summer in the Northern Hemisphere because the sun's rays are more concentrated. When Earth is farthest from the sun (aphelion), it experiences winter because the sun's rays are more spread out.
Earth's orbit is not a fixed path and can change over time due to various factors. The gravitational pull of other planets, asteroids, and comets can cause slight changes in Earth's orbit. Additionally, the Earth's tilt and axis wobble also contribute to changes in the shape and orientation of its orbit.
Yes, the shape and size of Earth's orbit are essential for sustaining life on our planet. If Earth's orbit were perfectly circular, the intensity of sunlight would remain constant throughout the year, resulting in extreme temperatures and making it difficult for plants to grow and thrive. The elliptical shape of Earth's orbit allows for a more gradual change in seasons, providing a stable and habitable environment for life.
Earth's orbit around the sun takes approximately 365.24 days or one year. This slightly longer time is due to the fact that Earth is also rotating on its axis, resulting in a slightly longer day. To keep our calendars in sync with the Earth's orbit, we add an extra day every four years (leap year).