Ajaühikuid

Ajaühikuid, or units of time, are standard measures used to quantify durations and intervals. The most commonly recognized unit is the second, which forms the basis of the International System of Units (SI) for time. From the second, other larger units are derived. A minute consists of sixty seconds, and an hour is composed of sixty minutes. A day is typically defined as twenty-four hours. Weeks are usually measured as seven days, months vary in length but are commonly around thirty days, and years are based on the Earth's orbit around the sun, approximately 365.25 days.

Beyond these everyday units, smaller increments are also used. Milliseconds, microseconds, and nanoseconds represent fractions of a second, becoming increasingly important in scientific and technological applications requiring high precision. Larger units like centuries (one hundred years) and millennia (one thousand years) are employed to describe historical periods. The concept of time units is fundamental to organizing schedules, recording events, and understanding sequences in both daily life and scientific endeavors. The precise definition of these units has evolved over time, with modern standards relying on atomic clocks for unparalleled accuracy.