A supermoon will be visible throughout the whole of Spain from 6.48pm this evening until 7.33am tomorrow. The moon can be viewed without a telescope or binoculars due to forecast clear skies.
It is called a supermoon because the moon shines 30 per cent more brightly and is 14 per cent larger than a micromoon (when the moon appears its smallest).
These discrepancies in size occur because moon has an eliptical orbit around Earth.
At its closest point (called the perigee), the moon is at least 356,000 kilometres away from Earth. At its furthest distance from earth (called the apogee), the moon is at least 406,000 kilometres away from Earth.
A supermoon occurs when a new moon (the first lunar phase) or full moon coincides with the perigee - the point at which the moon's eliptical orbit is closest to Earth. Seen from Earth, this has the effect of magnifying the moon.
The next important celestial dates for stargazers are 8 April and 7 May when two more supermoons will be visible. There will also be a red moon on 5 June.