seasonal sunsets

I like to watch the changing seasons and weather conditions from my balcony. Billowing clouds, driving rain, purple skies at night, it's all very interesting. Lately I've been enjoying the beautiful sunsets and I'm amazed with how far north the sunset has shifted over the last several months.  My balcony faces north and in the winter sunset was at nine o'clock.  I actually had to lean over the rail and look west to see it. Now the sun is setting at somewhere between ten and eleven on a clock face. It makes me appreciate how the Stonehenge builders and other ancients tracked the movement of the sun. I haven't started carving notches on the railing yet but it's tempting.