Year
In astronomy, the Julian year is a unit of time; it is defined as 365.25 days of exactly 86,400 seconds (SI base unit), totalling exactly 31,557,600 seconds in the Julian astronomical year.
Mathematical coincidence
formula_24 seconds is a nano-century: 100 years × 365.25 days per year (0.25 is for a leap day every fourth year) × 24 hours per day × 3600 seconds per hour = 3,155,760,000 sec ≈ "π" sec × 10 within 0.45%.