the.com/umbra
the darkest heart of a shadow, where light surrenders completely and gives up the ghost
eclipse coreTotal solar eclipses live inside Earth's umbra
latin rootsMeans shadow, parent word of umbrage and umbrella
taking umbrageOffense once meant being thrown into shade
sunspot anatomyDark center of a sunspot is called umbra
three zonesShadows split into umbra, penumbra, antumbra