Un an calendaristic gregorian are 365,2425 zile:
1 year = 365.2425 days = (365.2425 days) × (24 hours/day) × (3600 seconds/hour) = 31556952 seconds
Un an astronomic iulian are 365,25 zile:
1 year = 365.25 days = (365.25 days) × (24 hours/day) × (3600 seconds/hour) = 31557600 seconds
Un an calendaristic comun are 365 de zile:
1 common year = 365 days = (365 days) × (24 hours/day) × (3600 seconds/hour) = 31536000 seconds
Un an calendaristic bisect are 366 de zile (are loc la fiecare 4 ani):
1 leap year = 366 days = (366 days) × (24 hours/day) × (3600 seconds/hour) = 31622400 seconds
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