@cstross I stupidly looked at another
#astronomy #fact from this book.
The diagram clearly shows that it is always summer in the northern hemisphere and always summer in the southern hemisphere. Also that sunlight does not arrive at the Earth in a straight line from the Sun.
(I assume angular momentum is preserved by something doing something to the moon. Or perhaps that's explained in the chapter about Venus.)
The economics are truly intriguing:
1. Violate copyrights to build a
#slop_machine.
2. Pour everything possible into the blender.
3. Produce incorrect diagrams.
3a. You could literally steal a correct diagram!
3b. Or you could literally use a correct non-copyrighted diagram! NASA have a bunch.