Roger Stephens fine art artist artiste peintre

Jupiter Important to the ancient Babylonians, the brilliant planet Jupiter ruled the night sky and mapped out the Zodiacal constellations. IN ROMAN AND GREEK MYTHOLOGY the god Jupiter was accepted as the most powerful and capricious ruler of the heavens; no wonder ancient astronomers gave the same name to the planet that year after year so brilliantly rules the night sky. After the Sun and the Moon, Jupiter is, indeed, the most spectacular object in the sky. Although Venus is at times brighter it cannot ride the midnight sky as does Jupiter. Today's astronomers acknowledge Jupiter as being perhaps the most important planet of the Solar System. It is the largest and most massive. After the Sun-the star about which all bodies of the Solar System revolve -Jupiter contains two-thirds of the matter in the Solar System. Orbiting the Sun at an average distance of 779 million km (484 million mi.), Jupiter is some 5.2 times as far away as Earth. Cuneiforms of the Babylonian e...

HOW LONG DOES IT TAKE SUNLIGHT TO REACH THE EARTH? 8 minutes and 20 seconds Here’s the math. We orbit the Sun at a distance of about 150 million km. Light moves at 300,000 kilometers/second. Divide these and you get 500 seconds, or 8 minutes and 20 seconds. This is an average number. Remember, the Earth follows an elliptical orbit around the Sun, ranging from 147 million to 152 million km. At its closest point, sunlight only takes 490 seconds to reach Earth. And then at the most distant point, it takes 507 seconds for sunlight to make the journey. How fast does light travel from the Sun to each of the planets? Light travels at a speed of 299,792 kilometers per second; 186,287 miles per second. It takes 499.0 seconds for light to travel from the Sun to the Earth, a distance called 1 Astronomical Unit. below I list the light travel times from the Sun to each planet: Planet Distance in AU Travel time ....................................................

The first successful measurement of the speed of light (Eclipses of the Moon Io)

Statistics for Jupiter ...... Diameter......................88,823 miles (142,984 km) Known Natural Satellites......64 Mean Distance from the Sun....482,546,000 miles (778,330,000 km) Rotational Period......       9.84 hours             Orbital Period......          4333 days     =   11.87 years     Orbital Eccentricity......    0.0483 Orbital Inclination......     1.308 degrees Inclination of Axis......     3.12 degrees Mean Cloud Temperature......-185° F (-121° C) Main Atmospheric Component......Hydrogen Atmospheric Pressure......    0.7 bars Atmospheric Depth......       100 miles (161 km) Apparent Magnitude......     -2.7

La première observation connue d'Io est réalisée par Galilée le 7 janvier 1610. La découverte d'Io et des autres satellites galiléens est publiée par l'astronome dans son ouvrage Sidereus Nuncius en mars 1610. En 1614, dans son Mundus Jovialis, Simon Marius prétend avoir découvert ces objets en 1609, une semaine avant Galilée. Quelle que soit la validité des propos de Marius (Galilée, par exemple, le considère comme un imposteur et un plagiaire), Galilée est considéré comme le découvreur d'Io, ayant publié cette découverte le premier. Simon Marius  ( Latinized  from German  Simon Mayr ; January 20, 1573 – January 5, 1625) was a German  astronomer . He was born in  Gunzenhausen , near  Nuremberg , but he spent most of his life in the city of  Ansbach . In 1614 Marius published his work  Mundus Iovialis  describing the planet  Jupiter  and its moons. Here he claimed to have discovered the planet's four major moons some days befor...