[AdmSmith]

That is very close, but take the lap years into consideration then the length of the year is 365.242198 days and not 365.

An approximate calculation is here
http://www.jimloy.com/astro/year.htm

[AdmSmith]

Sorry lap =>leap ;-)

[Lawgvr1955]

That is very close, but take the lap years into consideration then the length of the year is 365.242198 days and not 365.

If you want to be that accurate you shouldn't use 186,000 miles per second. I believe the speed of light is closer to 186,284 miles per second. Plus there is some controversy whether the speed of light has remained constant throughout time.

http://www.ldolphin.org/cdkconseq.html