Are Wikipedia's sun ecliptic-coordinate formulae accurate? I'm creating a C++ program that calculates the ecliptic coordinates based on the formulae from Wikipedia But, my calculations appear off. The mean anomaly for today, for example, should be 80.4-something; both my program and Google calculate approx. 79.2 - the result of (357.528 + 0.9856003*5927) % 360 (where 5927 is the number of days since January 1, 2000, GMT)
Assuming that you used the time of 170900 EDT(-4 UT), which is 230900 UT, the following is my math:

Let the Julian Date for 25Mar2016 at 230900, which is 2457473.464583, be set to JD;

Given the formula (on Wikipedia:n = JD - 2451545.0 ), your n is 5928.464583.
Then, taking the second formula ( g = 357.528° + 0.9856003° * n ) you get g=357.528°+5843.0964715441749 = 6200.3544715441749 mod 360 = +80.35447°.  Were you to round up this would give +80.4.

Without how you handled your date/time in c++ and your rounding, I would wager that is were the error occurred.