#time unit

• Year — The fundamental unit of time representing the period required for the Earth to complete one full orbit around the Sun; calendar-wise, an interval of 365 days (or 366 days in leap years), divided into 12 months, beginning on January 1st and ending on December 31st. In a broader sense, it denotes a period of time linked to a specific activity, a person's age, or a historical era.
• Attosecond — An extremely short unit of time measurement, equivalent to one billionth of a billionth of a second, or ten to the power of minus eighteen seconds (10⁻¹⁸ s). This structural element represents the fundamental time scale at which the dynamic movements of electrons inside atoms and molecules occur, serving as a key unit in modern laser physics research rewarded with the Nobel Prize.