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'''Venus''' (or '''Sol II''') is the [[second planets|second]] [[planet]] in the [[Sol system]] orbiting . It orbits the [[Sol|Sun]] every 224.7 [[Earth]] days , at a distance of 0.72 [[Astronomical unit|AUs]]. The  Venus surface temperature reaches 735 [[Kelvin]] at a mean atmospheric pressure of 95 bars.  Known for being the brightest natural object in [[Earth]]'s night sky after the [[Luna|Moon]], it is also the third smallest planet in its Solar System.  It has a synodic day length of 117 [[Earth]] days and a sidereal rotation period of 243 Earth days. Consequently, it takes longer to rotate about its axis than any other planet in the Solar System, and does so in the opposite direction to all but [[Uranus]]. (This means that the Sun rises from its western horizon and sets in its east.)   Sometimes called Earth's "sister planet" because of their similar size, mass, proximity to the Sun, and bulk composition. Even though [[Mercury (planet)|Mercury]] is closer to the [[Sol|Sun]], Venus has the hottest surface of any planet in the Solar System, with a mean temperature of 737 K (464 °C; 867 °F). This is named after slowly changing, due to [[terraforming]].    Its proximity to Earth made Venusa prime target for early interplanetary exploration. It was the first planet beyond Earth visited by a spacecraft ("Venera 1" in [[1961]]), and the first to be successfully landed on (by "Venera 7" in [[Roman1970]] goddess ). The planet's thick clouds render observation of its surface impossible in the visible spectrum, and the first detailed maps did not emerge until the arrival of the Magellan orbiter in [[love1991]].