Aphelion

Point farthest from the sunOur parent star. The structure of Sun's interior is the result of the hydrostatic equilibrium between gravity and the pressure of the gas. The interior consists of three shells: the core, radiative region, and convective region. Image source: http://eclipse99.nasa.gov/pages/SunActiv.html. The core is the hot, dense central region in which the in a body’s elliptical orbitDescribes the characteristic oval orbital path of planets and asteroids around the Sun..