Joe is Vanguard's global chief economist and head of Vanguard Investment Strategy Group. He's also a member of the senior portfolio management team in Vanguard Fixed Income Group.
Apollo missions took about three days to reach the moon. But the quickest trip to the moon was the New Horizons probe, which zipped past the moon in just 8 hours 35 minutes on its way to Pluto. However, the spacecraft didn't even slow down or approach lunar orbit. Tidal forces.
The Moon itself puts out no light at all. It takes about four weeks for the Moon to orbit once around Earth. During this time, the Moon's position relative to Earth and the Sun is constantly changing. During part of its journey, the Moon is between Earth and the Sun. Then, a few days later, it is off to one side.t takes about four weeks for the Moon to orbit once around Earth. During this time, the Moon's position relative to Earth and the Sun is constantly changing. During part of its journey, the Moon is between Earth and the Sun.