Minute (min)
Definition: A minute is a unit of time equal to 60 seconds.
History/origin: The minute comes from the ancient sexagesimal time system inherited from Babylonian mathematics and later used in astronomy and civil timekeeping.
Current use: Minutes are used everywhere for schedules, durations, cooking, transport times, and appointments.
Year (yr)
Definition: The year is a long calendar unit based on Earth's solar orbit. For unit conversion, it is commonly averaged as 365.25 days.
History/origin: People organized years around seasons, planting cycles, and celestial observations, then refined them through calendars for civic and scientific use.
Current use: Yr is used for ages, anniversaries, mortgages, warranties, leases, climate averages, school grades, investment horizons, history timelines, and long-term records.