aphelion, and the nearest point, perihelion, of its orbit around the host Sun. The terms aphelion and perihelion apply in the same way to the orbits...

Perihelion Software Limited was a United Kingdom company founded in 1986 by Dr. Tim King along with a number of colleagues who had all worked together...

Perihelion is the point of closest approach to the Sun of a body orbiting the Sun. Perihelion may also refer to: Perihelion: The Prophecy, a 1993 role-playing...

direction of motion. For specific types of orbits, terms such as argument of perihelion (for heliocentric orbits), argument of perigee (for geocentric orbits)...

independently found by ATLAS South Africa on 22 February 2023. The comet passed perihelion at a distance of 0.39 AU (58 million km; 36 million mi) on 27 September...

Perihelion Summer is a science fiction novella/novel by Australian writer Greg Egan, published by Tor Books in 2019. Taraxippus, a double system of two...

is called longitude of perihelion ϖ, which is the sum of the longitude of the ascending node Ω, and the argument of perihelion ω. The longitude of periapsis...

Albert Einstein in 1915, concerned the "anomalous" precession of the perihelion of Mercury, the bending of light in gravitational fields, and the gravitational...

longitude of perihelion and the argument of perihelion of the TNOs with semi-major axes greater than 150 AU. Those with a longitude of perihelion of 0–120°...

of certainty, but Hale–Bopp exceeded most predictions when it passed perihelion on April 1, 1997, reaching about magnitude −1.8. It was visible to the...

Perihelion: The Prophecy is a role-playing video game developed by Morbid Visions and published by Psygnosis in 1993 for the Amiga. The player controls...

ωGeneral Relativity + ωquadrupole + ωtide + ωperturbations For Mercury, the perihelion precession rate due to general relativistic effects is 43″ (arcseconds)...

means that its perihelion, or point of closest approach to the Sun, at 76 AU is around 12.3 times closer than its aphelion. At perihelion, Sedna is only...

perihelion, Mercury's angular orbital velocity equals its angular rotational velocity so that the Sun's apparent motion ceases; closer to perihelion,...

Sun's photosphere at perihelion. The comet was bright enough to be visible next to the Sun in the daytime sky at its perihelion. The comet made its closest...

discovered by ATLAS-HKO in Hawaii on 27 September 2024. The comet passed its perihelion on 28 October 2024, at a distance of about 0.008 AU (1.2 million km; 0...

400,000 km; 37,600,000 mi) from the Earth. 96P/Machholz last came to perihelion on January 31, 2023. The comet has an estimated diameter of around 6.4 km...

November 2011 by Australian amateur astronomer Terry Lovejoy. The comet's perihelion took it through the Sun's corona on 16 December 2011, after which it emerged...

same time as the southern winter solstice). In modern times, Earth's perihelion occurs around January 3, and the aphelion around July 4. In other words...

measured from its perihelion, Earth's speed when in a solstice or equinox point changes over time: if such a point moves toward perihelion, the interval between...

Schwarzschild precession) is used in the prediction of the anomalous perihelion precession of the planets, most notably for the accurate prediction of...

sungrazing comet is a comet that passes extremely close to the Sun at perihelion – sometimes within a few thousand kilometres of the Sun's surface. Although...

Perihelion dates of 1531 and earlier are in the Julian calendar, while perihelion dates 1607 and after are in the Gregorian calendar. The perihelion dates...

as it passed close to the Sun. Reports on 28 November 2013 (the day of perihelion passage) indicated that Comet ISON had partially or completely disintegrated...

named. It most recently came to perihelion (closest approach to the Sun) on 2 November 2021, and will next come to perihelion on 9 April 2028. Churyumov–Gerasimenko...

Pluto came to perihelion in 1989, most Pluto perihelion date estimates are based on the Pluto–Charon barycenter. Charon came to perihelion 4 September 1989...

approached perihelion observers reported that it was clearly visible in the daytime sky next to the Sun. In Japan, where it reached perihelion at local...

and after each perihelion. They lasted 11.6 days for the earliest perihelion, and will drop to 9.6 days for the final, closest perihelion.: 8  Much of the...

comets, characterized by orbits taking them extremely close to the Sun at perihelion. At the far extreme of their orbits, aphelion, Kreutz sungrazers can be...

with the farthest known perihelion (closest approach to the Sun) in the Solar System, greater than Sedna's. Though its perihelion is farther, 2012 VP113...