It's naff all, 1 degree is 60 minutes, being as a clock has 360 degrees and 60 minutes.
Some tracking places now use this to express angles, rather than what we are used to so in your case it is 20 minutes = 1/3 of a degree.
The radian is a massively better way of expressing angles but not used apart from in trigonometrics functions, these are easier to understand once you've got used to them.
With the introduction of the decimal system there was an attempt to clear things up a bit with defining a decimal degree as grad or gon, a right angle would have 100 gon, a full cirle 400 gon, but anyway 1/3 of a degree, not enough imo.
tabetha