Jupiter is the biggest planet in our solar system, and so he has been the "ruler" of Mount Olympus - fact is, he does magnify every other celestial body he "touches", and it's his most famous part of "personality".

EXPANSION and growth in many ways of life. 

Beside that, he is also about beliefs, fairness, higher learning, foreign countries and cultures, he's of action and "mobilizing" from an optimistic foundation.

His task is not just "earthly" though - it's also about growth of awareness and consciousness. 

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Greek Mythology:

Zeus the son of Kronos and Rhea. He did take the "throne" from his father after he had successfully fought against the Titans and others. Together with some of his Siblings and Children (a total of 12) he ruled the Olymp. He was honored with different names, which gave his different attributes way to express - as protection of cities and homes, hospitality, keeping an oath as well as his own oracle. His weapon was the thunder and lightning and his animal the Eagle. His mission to keep "order" in the world but his word was rule - criticism wasn't allowed by neither of the other Gods/Goddesses. 

Some Astronomy:

Jupiter is a gas giant with a mass one-thousandth that of the Sun, but 2,5  times that of all the other planets in the Solar System combined. 

Jupiter is the only planet whose barycenter with the Sun lies outside the volume of the Sun, though by only 7% of the Sun's radius.

Jupiter orbits the Sun in a periodicity of 11.86 years. This is ca. two-fifths the orbital period of Saturn, forming a near orbital resonance between the two largest planets in the Solar System.

The elliptical orbit of Jupiter is inclined 1.31° compared to Earth. Because the small eccentricity of its orbit of 0.048, Jupiter's distance from the Sun varies by 75 million km between its nearest approach (perihelion) and furthest distance (aphelion).

The axial tilt of Jupiter is relatively small: only 3.13°. As a result, it does not experience significant seasonal changes, in contrast to, for example, Earth and Mars.

He rotates around his axis every 9 hours and 56 minutes, which marks his length of day. (from Wikipedia)