An aphelion is an event when a celestial body orbits around the sun at its farthest range. A perihelion is the opposite of aphelion when the celestial objects move around the Sun at its closest range. Any celestial object that orbits around the Sun will experience both Aphelion and perihelion at a certain period of time. Their difference may vary depending on the peculiarity if the object” orbit.
It’s a false notion that earth revolves around the Sun. The earth has its own elliptical orbit that makes it eccentricity very low as .0167 compared to Mercury with .2056 eccentricity.
Aphelion occurs in the Northern hemisphere’s summer and July. It moves around 30 minutes ever year accompanied a 21,000 year cycle. This means Earth’s aphelion falls in the Southern Hemisphere’s summer.
Earth’s distance from the Sun during perihelion is approximately 91 million miles (147 million kilometers). At aphelion, Earth’s distance is 95 million (152 million kilometers). This approximated distance will vary slightly as compared to many objects that orbits around the Sun.
Astronomers use the formulas of astronomical units (AU); Each AU represents the mean distance of the Sun from the Earth. Astronomers draw maps the paths that a mass of objects are tracked with their orbits around the Sun. These charts are found in the Atlases and Science textbooks, depicting the orbits each planet with their elliptical distance. The charts they made also depicted the future occurrences of aphelion and perihelion.