January 20th is one of the significant days recorded on my 2019 Japanese eco-calendar. It is described as the ‘Coldest time of the year’, known as Daikan (Great cold). This period covers January 20th to February 3rd and is the final of the 24 major divisions (sekki) of the traditional Japanese calendar. In Kyoto it was raining on the first day of Daikan in 2019 and the temperature reached 11 degrees celsius. Elsewhere in Japan the conditions would differ considerably, as I discovered in the winter of 2018 when I travelled from Okinawa in the south-west to Hokkaido in the north-east (see here). Wherever one finds oneself, paying attention to these finer changes in the seasons and natural world brings us closer to the elements around us. At an even finer level the 24 divisions can be split into 72 ko that last around five days each. As an example, the first five days of Daikan are called ‘Fuki no hana saku‘ (Butterburs bud). This attention to detail to the environment has many merits.