June Moon at Ascending Node and a Solar Eclipse

   Sunday June 21st the new Moon will be crossing the plane of the ecliptic moving north. This is known as the ascending node, one of two intersections the Moon’s orbital path has with the ecliptic. The ecliptic is actually the Earth’s orbit, and the Moon’s orbit is inclined about 6o from the ecliptic. So there are two node intersections, the ascending and descending nodes.
   Whenever our Moon at either new or full phase crosses the plane of the ecliptic, a node crossing, there will be an eclipse of the Sun with a new Moon, or a lunar eclipse with the full Moon phase. On the 21st the new Moon will be aligned with the Sun for a solar eclipse. (Not visible from North America) However this solar eclipse is an annular solar eclipse, where at mid-eclipse the Moon does not completely cover the Sun. There is no ‘diamond bead’ effect, no corona like what is seen with a total solar eclipse. This is because the Moon and our Sun appear to be about the same size in the sky with the exception that the Moon’s orbit is more elliptical than the Earth’s orbit around the Sun. This means that the Moon can be closer or further away during a solar eclipse. With this annular solar eclipse the Moon is further away, appears smaller than the Sun, and at mid-eclipse leaves an annulus, a ‘ring of fire’ around the Sun as this animated graphic is showing.
Note, I have brightened the side of the Moon facing toward us. During a solar eclipse we would only see a silhouette of the Moon.

   Does our Moon actually go around the Earth as many graphics show? From our perspective on the Earth the Moon appears to circle around the Earth. However, in reality, the Moon orbits the Sun together with the Earth*
*Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to return to bobs-spaces.

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