Month: July 2025

GNOMON
The part of a sundial that casts a shadow.

SUNDIAL
A device that tells time by using the position of the Sun’s shadow.

EPOCH
A reference point in time used to calculate celestial positions.

SOLSTICE
The point when the Sun reaches its highest or lowest position in the sky, marking the longest and shortest days of the year.

EQUINOX
The time when day and night are nearly equal in length, occurring in March and September.

LEAP YEAR
An extra day added to the calendar every four years to account for the fractional extra time in Earth’s orbit.

YEAR
The time it takes for Earth to complete one orbit around the Sun, about 365.25 days.

MONTH
A time unit based on the Moon’s orbit around Earth, approximately 29.5 days in a lunar month.

SOLAR DAY
The time between two successive solar noons, about 24 hours.

SIDEREAL DAY
The time it takes for Earth to rotate once relative to distant stars, approximately 23 hours, 56 minutes.