I'm trying to calculate my longitude, but can't seem to get the correct answer. Hopefully someone can explain to me what I'm doing wrong.
Today, local noon was at 11:40 AM. As I'm in EST (GMT -5), that means that local noon was at 16:40 GMT. As such, I'm 4:40 or 4.67 hours west of 0 degrees.
The sun moves 15 degrees per hour, so I calculate my longitude as 70.05 W.
However, my actual longitude is 74.016 W.
Note that local noon and actual longitude come from the same reference [http://www.timeandda...ty.html?n=179], so this disparity isn't due to measurement error.
What am I doing wrong?