The term 'eclipse shadows' refers to the umbra, which is a type of shadow created by an eclipse. An umbra is a cone-shaped shadow that is cast when an object blocks light from a source. During a solar eclipse, the umbra is created when the Moon passes between the Sun and Earth, blocking out the Sun's light. During a lunar eclipse, the umbra is created when the Earth passes between the Sun and Moon, blocking out the Sun's light. In both cases, the umbra creates a dark shadow on the surface of the Earth.