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Named after the ruler of the Roman gods, Jupiter is large and bright enough to be seen by the naked eye. In fact it is the fourth-brightest object in the night sky, after the [[Sun]], the [[Moon]], and the planet [[Venus]].<ref name=arnett>Arnett, Bill. "[http://www.nineplanets.org/jupiter.html Entry for Jupiter]." ''The <s>Nine</s> 8 Planets'', April 10, 2005. Accessed March 3, 2008.</ref> Jupiter is conspicuous and easy to recognize. An observer carrying 7-power field glasses (of a type used for birding or hunting) will see a round disk that shines steadily. An observer with a small telescope should also be able to resolve the [[Galilean moons]], as [[Galileo Galilei]] himself did. They will appear, as they did to Galileo, as "stars" traveling in "formation" with Jupiter and changing their positions relative to Jupiter in a single night of observation.

Named after the ruler of the Roman gods, Jupiter is large and bright enough to be seen by the naked eye. In fact it is the fourth-brightest object in the night sky, after the [[Sun]], the [[Moon]], and the planet [[Venus]].<ref name=arnett>Arnett, Bill. "[http://www.nineplanets.org/jupiter.html Entry for Jupiter]." ''The <s>Nine</s> 8 Planets'', April 10, 2005. Accessed March 3, 2008.</ref> Jupiter is conspicuous and easy to recognize. An observer carrying 7-power field glasses (of a type used for birding or hunting) will see a round disk that shines steadily. An observer with a small telescope should also be able to resolve the [[Galilean moons]], as [[Galileo Galilei]] himself did. They will appear, as they did to Galileo, as "stars" traveling in "formation" with Jupiter and changing their positions relative to Jupiter in a single night of observation.

The [[Babylonia]]ns believed that their god Marduk set Jupiter in the sky to guide the stars.<ref name=nelson>Nelson, Clark. "[http://www.timeemits.com/HoH_Articles/399-Day_Mean_Synodic_Period_of_Jupiter.htm 399-day Mean Synodic Period of Jupiter]."  <http://www.timeemits.com/>, 2006. Accessed March 3, 2008.</ref> Jupiter might have had an influence in the invention of several ancient calendars, including the Mayan calendar, the Egyptian calendar, the ancient (pre-Hillel II) Hebrew calendar, and possibly the calendar in use (at least by the [[Seth]]ite generations of Adam) before the [[Great flood|Great Flood]]).<ref name=nelson/>

The [[Babylonia]]ns believed that their god [[Marduk]] set Jupiter in the sky to guide the stars.<ref name=nelson>Nelson, Clark. "[http://www.timeemits.com/HoH_Articles/399-Day_Mean_Synodic_Period_of_Jupiter.htm 399-day Mean Synodic Period of Jupiter]."  <http://www.timeemits.com/>, 2006. Accessed March 3, 2008.</ref> Jupiter might have had an influence in the invention of several ancient calendars, including the Mayan calendar, the Egyptian calendar, the ancient (pre-Hillel II) Hebrew calendar, and possibly the calendar in use (at least by the [[Seth]]ite generations of [[Adam]]) before the [[Great flood|Great Flood]]).<ref name=nelson/>

== Orbital characteristics ==

== Orbital characteristics ==