you have to divide the degrees by 57.2 to get the radians
If you are going to the trouble of using the spreadsheet, better to use the normal conversion π/180.
I suggest, with your approach, that you are trying to measure a mile with a tape measure rather than an odometer ? End result is that you are playing with precision far finer than that inherent in the numbers to which you are making comparisons; with the result that you are getting needlessly confusing outcomes ?
J