I don't, just as many don't either, understand how the sunset and sunrise function on a flat earth, but all I know is that, it IS Flat, and this was just proven by NASA itself during the latest rocket-launch yesterday, April 14th 2015. Watch the video and advance it to the 20:18:55 time on rocket flight timer, there you will see, (AS PROOF!) that the earth is indeed FLAT!!!! They try to hide it as soon as they realize the fish-eye lens is not doing its job to trick us, and they also see what the flight's real-live video is showing, which is what the earth REALLY looks like, so they try to hide it by switching back to command post right after the 20:18:55 flight-time, they then switch back to where we again can see the FLAT earth horizon, but again only for a few seconds, cause then they switch back to command post where you can see all the phonies pretending to be monitoring the flight, which couldn't be further from the TRUTH. At that particular time, you can CLEARLY see how the earth's horizon really looks like, and which is as straight as a ruler. Check it out and see for yourselves. To me at least, that right there proves the earth is FLAT!...even though I still don't understand how on the flat earth the sunset and sunrise work as I said in the beginning? Anyway, it all just happened on the 14th of this week, so how can anyone dispute it when it is straight from NASSSSAAAAAAA, the Narcissistic ASS Administration!!!!!...