1 century has 3,155,760,000 seconds.
Most years have 31,536,000 seconds.
However, we also have to take into leap years.
A century has 100 years.
Leap year is every 4 years.
That means we have 25 leap years per century, dividing 100 by 4.
If it’s a leap year, then 1 year has 31,622,400 seconds.
Knowing this, we can do our calculation.
Seconds in a century calculation
= 75 normal years (seconds) + 25 leap years (seconds)
= 75 * 31,536,000 + 25 * 31,622,400
That’s almost 3.2 billion seconds.
How do we know the number of seconds in a year?
But let’s also back up for a second because we simply told you the number of seconds in a year.
Let’s go through step-by-step how we got there:
– We know that 1 year has 365 days (366 days during leap year).
– We know that 1 day is 24 hours.
– 1 hour is 60 minutes.
– And we know that 1 minute is 60 seconds.
So if we multiply all that through, we have:
= 365 days per year x 24 hours per day x 60 minutes per hour x 60 seconds per minute
= 31,536,000 seconds per year
Of course, now that you know that there are 86,400 seconds per day, you can calculate how many seconds there are…
– per week
– per year (above)
…and virtually every other expanse of time.