Annular solar eclipse

2013 May 9

The Sun will be eclipsed by the Moon. However, as the Moon will be close to apogee – the part of its elliptical orbit which takes it furthest from the Earth – it will appear slightly smaller than its average size of around 30 arcminutes across, in fact only 29.78 arcminutes, across, and not quite large enough to entirely cover the Sun’s face. Consequently, this eclipse will be an annular eclipse, in which a ring of light from the Sun will be left uneclipsed, even at maximum eclipse. The annular phase of the eclipse will occur at around 00h26 UTC – up to an hour earlier or later depending on your exact position along the eclipse track – and will last for a maximum of 6 minutes.