Full of light on the shortest day
Principle 1: Observe and interact Winter solstice, the day of Sen's first birthday, is the shortest day with the longest shadows. I thought that I would take some photos around midday to record the extremes - fortunately the sun came out to help me. Observing the solar gain in the living room at midday on winter solstice Sunlight heats most of the slab during the shortest day Whilst not necessarily the coldest time of the year, with temperatures hovering between 5ºC min and 14ºC max there have been a few frosts. Average temperatures get lower during the next month or two as the thermal mass of the earth cools down, a bit of a delayed reaction. During this time of the year we see sunlight (when it comes out) cover most of the slab, providing us with valuable radiant heat which is stored in the thermal mass of the concrete, helping to stablise the temperature of the house. It can get very bright in our living space and we sometimes close the curtains so that Kai can wat