![]() They’re named after the English astronomer Francis Baily, who first described them during the annular eclipse of May 15, 1836.Ĭhromosphere: A thin, red-colored layer of solar atmosphere located just above the photosphere. They appear just prior to second contact and just after third contact at annular and total solar eclipses. An observer standing in the antumbra sees an annular eclipse.īaily’s beads: Caused by shafts of sunlight shining through deep valleys on the lunar limb (edge), they look like a series of brilliant beads popping on and off. Within the antumbra, the Sun appears larger than the Moon, which is visible in silhouette. It can last from a fraction of a second to a maximum of 12 minutes 30 seconds.Īntumbra: The extension of the Moon’s shadow beyond the umbra. Annularity occurs between second and third contact. At mideclipse, the Sun appears as a blindingly bright ring, often called a "Ring of Fire," encircling the Moon.Īnnularity: The maximum phase of an annular eclipse, when the Moon’s entire disk is seen silhouetted against the Sun. You’ll find many of them used throughout this website and will encounter others on other sites and in the media as we get closer and closer to the August 21, 2017, solar eclipse across America.Īnnular eclipse: A solar eclipse where the apparent diameter of the Moon is too small to completely cover the Sun. The following are a number of terms used to describe various aspects of solar eclipses.
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