Thursday December 26th the Moon, at new Moon phase, crosses the plane of the ecliptic moving south. This is known as the descending node, one of two intersections the Moon’s orbital path (dark green line) has with the ecliptic.
What happens when the Moon is at new phase and is also at a node crossing? You get an eclipse of the Sun, which in this instance will be an Annular Solar Eclipse. This is a solar eclipse however the Moon is far enough from the Earth that it appears to be smaller than the Sun. So, unlike with a Solar Eclipse where at mid-eclipse the Moon’s disk covers the Sun’s disk, during mid-annularity the Moon’s disk does not completely cover the disk of the Sun but instead leaves a ‘ring of fire’ known as the annulus around the Sun.
This eclipse will be visible from Saudi Arabia to south of the Philippine Islands.
Note: The picture I used for the banner is of the 2011 Annular Eclipse and it is from the NASA Hinode satellite. Also at the NASA web page the link takes you to is a video of the Annular Solar Eclipse as seen from the satellite in Earth orbit.
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