What is a Great Circle?
When I first learned about great circles, I found them to be one of the most eye-opening, head-scratching and strangely beautiful concepts in navigation. I…
When I first learned about great circles, I found them to be one of the most eye-opening, head-scratching and strangely beautiful concepts in navigation. I…
The colour of water is determined by: A) What’s under it. B) What’s in it. C) What’s on it. D) And by light levels and…
However clear the sky, however free from even the wispiest of clouds, the sky is never uniformly blue. It is always closer to white near…
I did a short piece for BBC Inside Out that was broadcast on Monday evening. It can be viewed via this link (within the UK,…
Following some bad weather recently, I saw the beautiful ‘mackerel sky’ above. A mackerel sky can be used to forecast weather, but it is at…
Thank you to everyone who has come to my talks on How to Read Water recently. The morning after the Dartmoor talk, I took the…
My thanks to Alan Gibson, author of the Urbane Forager blog and book, for sending me these great images of a contrail shadow. (Contrails are…
My thanks to Pertti Pesonen for reminding me of these passages in Joshua Slocum’s classic, ‘Sailing Alone Around the World’: On the 12th, some hundred…