How many seconds are in a million centuries?

Answer 1

By mathematical computation, at 60 seconds per minute, 60 minutes per hour, 24 hours per day, and 365.25 days per year, the answer would be : 31,557,600 seconds per year, 3,155,760,000 per century, or 100 years.

However, by the more precise definition (which requires adjustment of the calendar with "leap seconds" and omitted "leap days"), there are 31556925.9747 seconds in a standard SI year, which equals approx 3,155,692,597,470,000 per million centuries. However, over that long a period, the length of the earth year will change due to a variety of factors: precision of equinoxes, the gravitational effects of other planets, tidal drag and the effect of the moon's gravity (which, in turn, depends on sea levels), changes in the mass of the sun due to thermonuclear fusion, solar flares and solar winds, et cetera. So do not read too much into the level of precision given above!