Month: July 2025

BIG BANG THEORY
The modern cosmological model stating that the universe originated from a singular point and expanded.

PRECESSION
The slow wobble of Earth’s rotational axis, first noted by Hipparchus.

EPICYCLES
Circular orbits within orbits used in Ptolemy’s geocentric model to explain planetary motion.

OBSERVATORIES
Facilities designed for studying celestial objects, with early examples found in ancient cultures.

ISLAMIC ASTRONOMY
The development of astronomy in the Islamic world, including advancements in observational techniques and mathematical models.

CHINESE ASTRONOMY
Ancient Chinese observations of celestial events, such as comets and eclipses, recorded in historical texts.

AZTEC ASTRONOMY
The astronomical practices of the Aztecs, including their calendar system based on celestial observations.

ALMAGEST
A work by Ptolemy that compiled astronomical knowledge and geocentric theories.

HIPPARCHUS
An ancient Greek astronomer who created a star catalog and discovered the precession of the equinoxes.

ARISTOTLE
A Greek philosopher who argued for a geocentric universe with crystalline spheres.