
The Moon orbits Earth in an elliptical path that brings it 50,000 km closer to our planet on one side of its orbit than on the other.
The Moon will shine especially bright this weekend, as it will come closer to Earth during its full phase than at any other time in 2009.
The Moon does not orbit Earth in a perfect circle. Instead, it follows an elliptical path that brings it 50,000 kilometres closer to our planet on one side of its orbit (called perigee) than the other (apogee).
On Saturday, 10 January, the Moon will reach perigee, coming within 357,500 kilometres of Earth. The next day, it will enter its full phase, when its disc appears completely illuminated by the Sun.
This will make it about 14% bigger and 30% brighter than typical full Moons (see the difference in the full Moon's size in 2004).