If you want to be really technical your equation is not correct. I assume the .25 is the attempt to account for leap year but this is according to the Julian calender. The Gregorian calender better fixed the error introduced by the Julian calender. So your equation would work better if you used 365.24219878 days per year.
For some reason Tmillers' reply reminded me of a bumper sticker I saw the other day: "Not only do engineers not have a life, they can mathematically prove it!"
Strangely enough, I learned about the whole Julian and Gregorian calender stuff from my wife last night. She tutors a fifth grader who asked a question about leap year. I just looked up the number so i could sound smart.
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