The closest celestial object with bound synchronous rotation is the Moon, which is tidally locked to Earth. This means that the Moon rotates on its axis in the same time it takes to orbit Earth, resulting in the same side always facing our planet. To confirm this, one could examine the orbital mechanics and tidal forces involved in the Earth-Moon system. Other celestial bodies, such as some moons of Jupiter and Saturn, also exhibit synchronous rotation, but they are farther away. Thus, the Moon remains the nearest example of this phenomenon.