I won't be doing anything in particular to celebrate the solstice--at least, I haven't any plans for anything. But in the 20 years I've lived in my high-rise home on the grid pattern of Philadelphia streets, I've learned to enjoy watching the apparent movement of the sun north and south along the horizon. I mean, at this time of the year, the sun appears to rise farther north than my building, which is located on an east-west street. As the season advances from now toward the autumnal equinox and then the winter solstice, eventually the sun will appear to rise directly opposite the window in the end of the hallway on my floor. Then sunrise will continue to move farther and farther south till I can actually see it from my windows. By the same token, right now sunset is farther north than my building. By October, after the autumnal equinox, I will be able to see sunset from windows.