Annular eclipses, are similar to total eclipses in that they occur when the moon lines up with the sun. But in this case, the moon is near apogee — the farthest point from Earth in its orbit around our planet — so it's too small in the sky to cover the sun's face completely. On May 20, 2012, an annular solar eclipse of the sun occurred when the moon blocked about 94 percent of the sun. What is seen is sometimes called a, "Ring of Fire". It is a beautiful sight. Sun was imaged in hydrogen-alpha (Ha) light in this image. The Sun sat before the eclipse was over. Lake Powell Arizona.