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Why don't they change the length of a second?

Author : george

Submitted : 2017-06-17 18:17:22    Popularity:     

Tags: change  length  

If they made 1 second = 1.0146 would'nt that get rid of the need for an extra day every 4 years? making a solar year accurate

Answers:

No, changing the length of a second would not get rid of the need for an extra day every four years. There are 146,097 sunrises (and sunsets) in 400 years, and changing the length of a second, or an hour, or the length of a yard, or the color of your socks, is not going to add or subtract any sunrises.

146,097 / 400 = 365.2425

That average number of days in a year has not changed significantly for millions of years, and is not going to change for many millions more. You can debate the last digit .. should it be 365.2422 ? ..., but that's not significant here.

We hold the interval between two sunrises (ot n oons to be more precise) sacrosanct.

The days would draw ft

m

Because the unit of second is based on the length of a day. A second is defined as exactly 1 / 86,400th the length of a (solar) Earth day (or in other words, a rotation is *exactly* 24 hours.)

You could redefine the second based on an exact number in one year, but then you would screw up the daily precision. It would be impossible to have a unit that divides evenly into both days and years, because days do not divide evenly into years.

In a very short while, the sun would be rising at 9 PM. That would not be okay with most people.

Don't even bother. If we went from BC to AD, what happened to Year Zero?



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