Time Converter

From:	To:
atomic unit of time [au] Callippic cycle Century [c] Day [d] Decade [dec] Fortnight [fn] Helek Hipparchich cycle Hour [h] Jiffy [j] Jiffy (Alternative) [ja] Ke (quarter of an hour) Ke (traiditional) Lustre; Lustrum Metonic cycle; enneadecaeteris Millennium Millday [md] Minute [min] Moment Month [mo] Octaeteris Planck time Second (SI base unit) [s] Shake Sigma Sothic cycle Svedberg [S] Week [wk] Year (common) [a, y, yr] Year (Gregorian) Year (Julian) Year (leap) Year (mean tropical)	atomic unit of time [au] Callippic cycle Century [c] Day [d] Decade [dec] Fortnight [fn] Helek Hipparchich cycle Hour [h] Jiffy [j] Jiffy (Alternative) [ja] Ke (quarter of an hour) Ke (traiditional) Lustre; Lustrum Metonic cycle; enneadecaeteris Millennium Millday [md] Minute [min] Moment Month [mo] Octaeteris Planck time Second (SI base unit) [s] Shake Sigma Sothic cycle Svedberg [S] Week [wk] Year (common) [a, y, yr] Year (Gregorian) Year (Julian) Year (leap) Year (mean tropical)

Time, as a concept, is fundamental to our understanding of the universe and plays a crucial role in various aspects of our lives, from measuring durations to understanding the dynamics of the cosmos. Here's a breakdown of time as units:

• Second (s): The second is the base unit of time in the International System of Units (SI). It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom.
• Minute (min): A minute is a unit of time equal to 60 seconds. It is commonly used in everyday life for measuring short durations.
• Hour (hr): An hour is a unit of time equal to 60 minutes or 3,600 seconds. It is commonly used for longer durations, such as in scheduling appointments or measuring the length of events.
• Day: A day is defined as the time it takes for the Earth to complete one rotation on its axis. It is divided into 24 hours.
• Week: A week consists of seven days. It is a common unit of time used in various calendars and scheduling systems.
• Month: A month is a unit of time based on the motion of the Moon around the Earth. There are different definitions of a month, including the lunar month (the time between two successive new moons) and the calendar month (based on the Gregorian calendar), which varies from 28 to 31 days.
• Year: A year is the time it takes for the Earth to complete one orbit around the Sun. There are different types of years, including the tropical year (the time between two successive vernal equinoxes), the sidereal year (the time it takes for the Earth to complete one orbit around the Sun relative to the fixed stars), and the calendar year (based on various calendar systems).
• Decade: A decade is a period of ten years.
• Century: A century is a period of one hundred years.
• Millennium: A millennium is a period of one thousand years.

These are some of the commonly used units for measuring time. Time measurement is crucial in various fields, including physics, astronomy, engineering, and everyday life. It allows us to understand the dynamics of the universe, create schedules, and coordinate activities.

Definition of all time units are:

1. Atomic unit of time [au]: The atomic unit of time is a unit used in quantum mechanics, representing the characteristic time scale for atomic and subatomic processes.
2. Callippic cycle: A Callippic cycle is a period of 76 years, named after the Greek astronomer Callippus. It is approximately equal to four Metonic cycles.
3. Century [c]: A century is a period of 100 years.
4. Day [d]: A day is the time it takes for the Earth to complete one rotation on its axis, approximately 24 hours.
5. Decade [dec]: A decade is a period of ten years.
6. Fortnight [fn]: A fortnight is a unit of time equal to two weeks, approximately 14 days.
7. Helek: Helek is a biblical unit of time, mentioned in the Old Testament.
8. Hipparchich cycle: A Hipparchic cycle is a period of 304 years, named after the Greek astronomer Hipparchus.
9. Hour [h]: An hour is a unit of time equal to 60 minutes.
10. Jiffy [j]: Jiffy is an informal unit of time, typically referring to a very short duration.
11. Jiffy (Alternative) [ja]: Another representation of the jiffy unit.
12. Ke (quarter of an hour): Ke is a traditional Chinese unit of time, approximately equivalent to a quarter of an hour.
13. Ke (traditional): Another representation of the ke unit.
14. Lustre; Lustrum: Lustre or lustrum is a period of five years, particularly in ancient Rome, associated with a census and purification rituals.
15. Metonic cycle; enneadecaeteris: The Metonic cycle is a period of 19 years, after which the phases of the moon recur on the same days of the solar year.
16. Millennium: A millennium is a period of 1000 years.
17. Millday [md]: Millday is a unit of time equal to one-thousandth of a day.
18. Minute [min]: A minute is a unit of time equal to 60 seconds.
19. Moment: Moment is an archaic unit of time, often used to signify a brief, indefinite period.
20. Month [mo]: A month is a unit of time based on the motion of the moon around the Earth.
21. Octaeteris: Octaeteris is a period of eight years.
22. Planck time: The Planck time is the smallest meaningful unit of time in the realm of theoretical physics, representing the time it takes for light to travel the Planck length in a vacuum.
23. Second (SI base unit) [s]: The second is the base unit of time in the International System of Units (SI).
24. Shake: Shake is an informal unit of time used in nuclear physics, representing 10 nanoseconds.
25. Sigma: Sigma is a unit of time, though its exact definition may vary depending on context.
26. Sothic cycle: A Sothic cycle is a period of approximately 1460 years, named after the Egyptian star Sothis (Sirius).
27. Svedberg [S]: The svedberg is a unit of time used in sedimentation analysis, particularly in ultracentrifugation.
28. Week [wk]: A week is a unit of time equal to seven days.
29. Year (common) [a, y, yr]: A common year is a period of 365 days, with 366 days in a leap year.
30. Year (Gregorian): The Gregorian year is a period based on the Gregorian calendar, which is commonly used in the Western world.
31. Year (Julian): The Julian year is a period based on the Julian calendar, introduced by Julius Caesar.
32. Year (leap): A leap year is a year that contains an additional day, February 29th, to keep the calendar year synchronized with the astronomical year.
33. Year (mean tropical): The mean tropical year is the average length of a year based on the time it takes for the Earth to complete one orbit around the Sun relative to the vernal equinox.