Month: July 2025

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.

DAY
A 24-hour period based on one full rotation of the Earth.

LUNISOLAR CALENDAR
A calendar that combines elements of both solar and lunar cycles, such as the Chinese calendar.

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

SOLAR CALENDAR
A calendar based on the Earth’s orbit around the Sun, such as the Gregorian calendar.

CALENDAR
A system of organizing days for social, religious, and administrative purposes, often based on astronomical observations.

TIMEKEEPING
The process of measuring and tracking time using various devices and methods.