appearance blue clear craters daytime distance distant glowing hidden light moon moonscape orbit orbiting out-of-shape partial partial-visibility phases reflection shadow shadows shape shapes sky southern-sky sunlight visibility brick bridge cantilever clouds coast cross Edinburgh estuary famous Forth grey iron landmark metal paint painting Queensferry rail railway red river rocks scotland sea shore span stone tower train water gray night-light partial visibility southern sky road suspension cannon capital castle city cliff cloud cloudy defence defences defense defenses flag flower flowers fort fortress garrison green hill precipice rampart rock soldier sun tree trees wall walls white