Perihelion
Perihelion is the point in the orbit of a planet or other celestial body where it is closest to the Sun. For Earth, perihelion occurs annually in early January, when the planet is about 147 million kilometers (91 million miles) from the Sun.
Source: ssd.jpl.nasa.gov
APODs including "Perihelion"
Rosetta and Comet Outbound
28/11/2015
Not a bright comet, 67P/Churyumov-Gerasimenko now sweeps slowly through planet Earth's predawn skies near the line-up of planets along the ecliptic. Still, this composite of telescopic images follows the comet's progress as it moves away from the Sun beyond the orbit of Mars, from late September (left) through late November (far right). Its faint but extensive coma and tails are viewed against the colorful background of stars near the eastern edge of the constellation Leo. A year ago, before its perihelion passage, the comet was less active, though. Then the Rosetta mission's lander Philae made its historic landing, touching down on the surface of the comet's nucleus.