panorama landscape view of alps in switzerland from the top of rigi kulm on twilight time and c-d of the moon

air alpine alps astrology astronomy atmosphere background beautiful black blue clear clouds cold color colorful colors crater crescent cshaped dark detail fresh green half hiking hill hills isolated kulm landscape light lucerne lunar luzern meadow moon moonlight mountain mountains mountaintop natural nature night orbit peak phase planet rigi scenery scenic science shape sky snow snowy space sun surface switzerland telescope top travel twilight view winter