Month: July 2025

GNOMON
The part of a sundial that casts a shadow.

SUNDIAL
A device that tells time based on the position of the Sun’s shadow.

SOLAR CALENDAR
A calendar system based on the Earth’s orbit around the Sun.

LUNAR CALENDAR
A calendar system based on the phases of the Moon.

NEWTON’S LAWS OF MOTION
Three fundamental laws that describe the relationship between the motion of an object and the forces acting on it.

KEPLER’S LAWS
Three laws describing planetary motion around the Sun.

COSMOLOGY
The study of the origins, evolution, and structure of the universe.

DARK MATTER
A hypothetical form of matter that does not emit light but has gravitational effects.

GRAVITATIONAL LENSING
The bending of light by massive objects, predicted by Einstein’s General Relativity.