ecliptic orbit
81Orbital period — For the music album, see Orbital Period (album). The orbital period is the time taken for a given object to make one complete orbit about another object. When mentioned without further qualification in astronomy this refers to the sidereal period …
82Equation of time — The equation of time is the difference over the course of a year between time as read from a sundial and time as read from a clock, measured in an ideal situation (ie. in a location at the centre of a time zone, and which does not use daylight… …
8390377 Sedna — Infobox Planet bgcolour=#FFFFC0 name=90377 Sedna caption= Sedna is located in the center of the green circle discovery=yes discovery ref=cite web title=Discovery Circumstances: Numbered Minor Planets (90001) (95000) publisher=IAU: Minor Planet… …
84Declination — For other uses, see Declination (disambiguation). In astronomy, declination (abbrev. dec or δ) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. Declination in astronomy is… …
85Chinese calendar — The Chinese calendar is a lunisolar calendar, incorporating elements of a lunar calendar with those of a solar calendar. It is not exclusive to China, but followed by many other Asian cultures as well.[1] In most of East Asia today, the Gregorian …
86Haumea (dwarf planet) — Infobox Planet bgcolour = #FFFFC0 name = Haumea caption = Artist s conception of Haumea, with its moons, Hiokinaiaka and Namaka discovery = yes discoverer= Brown et al. ; Ortiz et al. (neither official) discovered=2004 December 28 (Brown et al.… …
87Traditional Chinese star names — are the names of stars used in ancient Chinese literature, history, religion, mythology, folklore, Chinese opera and such methods of divination as astrology, horoscope (火羅) and Feng shui. Chinese star names sometimes consist of a Chinese… …
88Cassini's laws — ▪ astronomy three empirical rules that accurately describe the rotation of the Moon, formulated in 1693 by Gian Domenico Cassini. They are: (1) the Moon rotates uniformly about its own axis once in the same time that it takes to revolve around… …
89Milky Way — This article is about the galaxy. For other uses, see Milky Way (disambiguation). Milky Way galaxy Image of the Milky Way s Galactic Center in the night sky above Paranal Observatory Observation data …
90Equinox — This article is about the astronomical event when the sun is at zenith over the Equator. For other uses, see Equinox (disambiguation). For the same event happening on other planets and setting up a celestial coordinate system, see Equinox… …
