sunset
A sunset shiny app based on hilaryparker's code
https://github.com/hilaryparker/Hilary/blob/master/R/create_sunset_cal.R
Blog post:
http://hilaryparker.com/2014/05/27/sunsets-in-google-calendar-using-r/
Data:
The list of cities and lat/long was found on this StackOverflow post:
http://stackoverflow.com/a/7155947
Which leads to:
http://www.partow.net/miscellaneous/airportdatabase/#Download