When the sun, the moon, and Earth are all perfectly aligned and result in a lunar eclipse, the order from one side to the other is Sun - Earth - Moon. This is because a lunar eclipse occurs when the Earth passes between the Sun and the Moon, casting a shadow on the Moon. As a result, the Moon can enter the Earth's umbra (the central, darkest part of the shadow) and penumbra (the partial outer shadow), leading to either a total or partial eclipse of the Moon.
