Well, there's still a few places where the solar terms are still used--in China itself they are marked on many calendars since the farmers still use them. And here in Japan, they are also known by many people, especially the older ones. One in particular is marked by everyone, Setsubun--Feb. 3rd, the start of spring (like our Groundhog Day). In Japan, some people dress up as ogres and the children throw soybeans or other legumes (usually peanuts) at them while shouting "onni wa soto, fuku wa uchi!" (ogres out, luck in). Just as weird as Groundhog Day really, and marked at the same time for the same reason.