Re: BB: Circumference of the earth at a given latitude

On Sunday, September 20, 2009 at 6:45:50 PM UTC-6, Erin wrote:
> Yeah, okay, I should already know this, but I'm having a "duh" moment.
> Given that the circumference of the earth at the equator is
> *approximately* 24,000 miles, how does one figure the circumference of
> the earth at 60'N Latitude (Anchorage)?
> Erin.

The circumference of the 60° latitude line is 12450.73 miles.
Go to ==> https://www.vcalc.com/wiki/MichaelBartmess/Rotational+Speed+at+Latitude
Enter your latitude to get the rotational speed in miles per hour.
Multiply the rotational speed (in mph) at your latitude by 23.934472 (as in, number of hours per day in reference to distant stars, not the sun).
That will give you the approximate circumference value of 60° latitude.