[time-nuts] Q/noise of Earth as an oscillator
hmurray at megapathdsl.net
Mon Aug 1 14:54:31 EDT 2016
glennmaillist at bellsouth.net said:
> In navigation we used the earth rate of 15.04 degrees per hour. This was
> treated as a 'constant' even though it varied with wind, waves on the ocean
> and other things affecting the instantaneous rotational speed of the earth.
Were the wind and waves and whatever significant? Measurable?
> How does this factor into leap seconds, or, does it?
Leap seconds are necessary to correct for the unpredictable things like waves
and earthquakes and ice caps melting.
There is also tidal friction which is slowing down the rate of rotation. So
even if the wind and friends were insignificant we would need to adjust the
> We accept that the day is 24 hours long, this would be for a earth
> rotational speed of 15.0 degrees per hour.
The 0.04 is the difference between solar (sun) and sidereal (stars) time.
During a year, the earth goes around the sun. If your clock runs on solar
time but you are looking at the stars, that adds one more rotation per year.
That's 360/365 degrees per day or 0.04 degrees per hour.
These are my opinions. I hate spam.
More information about the time-nuts