Josh Clark

I bought one for Emily a few years ago.

Cute.

That kind of sundial is what the Muslims came up with that the

one that's got the flat circular base, and that gnomon is...

Am I saying that right?

Yeah.

The gnomon is parallel to the polar axis of the planet Earth.

Yeah, they also laid trigonometry on the whole thing and came up with a bunch of different kinds of sundials.

There's one that was conical.

And remember the hemicycle?

Imagine taking that and just kind of squishing the bowl and adjusting it at an angle.

That's what a conical sundial is.

They look amazingly cool.

So I say look one of those up.

And then finally, I think before we break, we should give a shout out to early 13th century Moroccan mathematician Abu al-Hazan al-Marakushi, because this is the dude that was finally like, you know what?

Uniform hours is where it's at.

And we should start kind of keeping track of this stuff in a uniform way, like actual real timekeeping.

And that kind of spread out all over the world from there.

Very nice.

Yeah.