Ajamäärussüsteem

Ajamäärussüsteem refers to the system of rules and conventions used to define and measure time. This encompasses the division of time into units such as seconds, minutes, hours, days, weeks, months, and years. It also includes the methods by which these units are standardized and synchronized across different regions and applications.

The most widely adopted system is the Gregorian calendar, which is used for civil purposes internationally. This calendar is a solar calendar, meaning it is based on the Earth's revolution around the sun. It is designed to approximate the tropical year, which is the time it takes for the Earth to complete one orbit relative to the vernal equinox.

Beyond the calendar, timekeeping systems also involve the definition of the second as the base unit of time in the International System of Units (SI). This definition is based on fundamental physical constants. Atomic clocks, which utilize the resonant frequencies of atoms, are the most accurate devices for measuring time according to this standard.

Ajamäärussüsteem also addresses issues like time zones, which are regions that observe a uniform standard time. These are typically based on offsets from Coordinated Universal Time (UTC), the primary time standard by which the world regulates clocks and time. Daylight Saving Time is another component, where clocks are advanced by an hour during warmer months to extend daylight into the evening. The standardization of time is crucial for navigation, communication, scientific research, and the coordination of global activities.