Lunar Formations

Invention/Contribution

• Muslim scholars studied the formation and surface of the Moon, moving away from myths to science.

• Al-Biruni (973–1048) suggested that the Moon’s surface features (craters and valleys) were caused by differences in material and not by it being a smooth, perfect sphere.

• He explained why the Moon reflects light from the Sun rather than producing its own light.

• His observations connected astronomy with physics and geology, centuries before modern science confirmed them.

Why it matters

• Helped establish a scientific approach to studying celestial bodies.

• Anticipated modern ideas about lunar geology.

• Showed how Muslim astronomers united observation, mathematics, and reason in understanding the natural world.

“The moon we see is not luminous in itself, but receives its light from the sun.”

Al-Biruni, Al-Qanun al-Mas’udi (11th century)

Centuries before telescopes, Muslim scientists asked: how was the moon formed and why does it shine? Al-Biruni studied its craters, shadows, and reflected light, realizing the moon was not perfect but a rocky body lit by the sun. His ideas foreshadowed modern lunar geology and showed how Muslims turned careful observation into scientific discovery. For them, the moon was not only a calendar in the sky but also a window into the secrets of creation.