timer settings

I have my coop hooked up with lights and timers right now. I have read around a little bit and done some experimenting myself. People say it's best to give the chickens a natural sunset. So, don't have the lights come on in the evening/early night. Is that true? Right now I have the timers to...

I just cannot understand how to do settings for Intermatic Timer to run the D20 motor that raises and lowers chicken door. I am ok with the mechanical details but these timer settings confuse the cluck out of me! Can someone provide 2 closeup photos - of timer settings and D20 setting? My times...