This graphic shows the Earth's postition on its orbit around the sun on December 1st with colors that indicate the southern hemisphere's seasons. Popularly seen they enter the three-monthly summer season, astronomically seen this will happen in three weeks only when they'll have the longest day / shortest night and the incoming solar radiation will be at its maximum. Interesting that after this day the temperature will still increase for a while in spite of the decreasing solar radiation. This must have something to do with the thermal capacity of the sea and the land: it is warming up as long as the absorbed energy is greater than the emitted energy. And when does their summer begin phenologically seen? This is the question I want to investigate with you in an additional project I'm developing and plan to start up sometime next year.