I feel like I should be offended about the Northern Hemisphere-centric nature of the plot. What about the lack of sunlight below 42 S from May to July?
(Admittedly that only includes half of New Zealand's South Island, the tip of Tasmania, and part of Patagonia. Plus all of Antarctica, but I assume if you're wintering in Antarctica you're probably well aware of Vitamin D deficiency.)
(Admittedly that only includes half of New Zealand's South Island, the tip of Tasmania, and part of Patagonia. Plus all of Antarctica, but I assume if you're wintering in Antarctica you're probably well aware of Vitamin D deficiency.)