In June's "Weather" (which I have just got round to reading) there is a
picture of euphoric rays on page 143 and discussion of crepuscular rays
on page 175. What's the difference?

I've never heard of "euphoric rays" before. I've heard of and seen
crepuscular, but when I think about it, I'm not sure how they're
produced. What's illuminated - dust and other atmospheric particles?

Trevor
http://www.personal.dundee.ac.uk/~taharley/