Sub-solar latitude on Triton over time. Upper panel: overview of the sub-solar latitude on Triton versus time over the last millennium. The blue part corresponds to the period from the V2 encounter (August 1989) to the 5 October 2017 stellar occultation. It shows that during this interval, Triton experienced an extreme summer solstice in its southern hemisphere, with a minimum sub-solar latitude of 50° S in 2000. Lower panel: close-up view of the upper panel around the year 2000. The black points correspond to occultations observed, distinguishing from the black triangle (V2 RSS experiment). The larger symbols are from the data that we use in this paper.