Re: Maine @ RPI, 12/29/17 & 12/30/17
December 29, 2017 sunset 4:29PM in Troy, NY and 4:02PM in Bangor, ME. For these two cities the difference is driven by equal parts longitude and latitude.
I would have to check when it happens in Troy because it is latitude-dependent, but here in DC the earliest sunset is about on 12/6 and the latest sunset about on 1/6. The combination makes the shortest day on about 12/21. The dates get closer together when you go towards the pole.
Edit: http://earthsky.org/earth/winter-solstice-and-late-sunrise
December 29, 2017 sunset 4:29PM in Troy, NY and 4:02PM in Bangor, ME. For these two cities the difference is driven by equal parts longitude and latitude.