When the Earth's shadow covers the sun's light, which would normally reflect off the moon, a lunar eclipse occurs. Total lunar eclipses, partial lunar eclipses, and penumbral lunar eclipses are the most spectacular, with the Earth's shadow totally covering the moon. Throughout history, eclipses have impressed awe and even worry, particularly once total satellite eclipses turned the moon chromatic. NASA maintains a list of predicted lunar eclipses till 2100.