Here is a way to plot the time of sunrise (in minutes after midnight) on the first of the month in 2015:

DateListPlot[
 Table[With[{time = DateList[Sunrise[{2015, i, 1}]][[4 ;;]]}, {{2015, 
     i, 1}, time[[1]] 3600 + time[[2]] 60 + time[[3]]}], {i, 1, 12}], 
 Joined -> False]

and you could do similarly for Sunset. This gives you the plot at the location where the execution takes place. To plot it at a specific location using GeoPosition:

DateListPlot[
 Table[With[{time = 
     DateList[
       Sunrise[GeoPosition[{30, -80}], {2015, i, 1}]][[4 ;;]]}, {{2015, i, 1}, 
    time[[1]] 3600 + time[[2]] 60 + time[[3]]}], {i, 1, 12}], 
 Joined -> False]

and compare two locations

DateListPlot[{Table[
   With[{time = 
      DateList[
        Sunrise[GeoPosition[{20, -80}], {2015, i, 1}]][[4 ;;]]}, {{2015, i, 1}, 
     time[[1]] 3600 + time[[2]] 60 + time[[3]]}], {i, 1, 12}],

  Table[With[{time = 
      DateList[
        Sunrise[GeoPosition[{70, -80}], {2015, i, 1}]][[4 ;;]]}, {{2015, i, 1}, 
     time[[1]] 3600 + time[[2]] 60 + time[[3]]}], {i, 1, 12}]
  }, Joined -> False]