NavList:

Paul Saffo, you wrote that you "did a double-take upon inspecting their diagram more closely".

Interesting! There was nothing here that make me do a "double-take" necessarily... Maybe I read too fast. What errors are you seeing?

Some details I might change (not essential, but things that might be changed for better pedagogy):

• RA and Dec can be, and often are, quoted in decimal degrees in the modern world. The time-based accounting of RA is important both historically and continuing as a curiosity today, but RA is just an angle, much like longitude, but "tied to the sky".
• That spot with zero RA, the sky's verion of the prime meridian, is called Aries, and the name is widely used, despite the astrological connection. Why avoid it? Maybe someone in the editorial chain was concerned about the suggestion of "astrology".
• This is probably the worst... The labeling of latitude and longitude on the globe diagrams is technically correct, but bound to cause confusion. One one side, the arrows point to the lines or circles of latitude and longitude. On the other side, the directions in which Dec and RA are measured are displayed. This is a case of common confusion: on the globe latitude is measured increasing upward, north of the equator, but a line of contant latitude on the globe runs east-west.
• Yes, longitute! Detecting spelling errors in graphics is remarkably difficult. Graphic artists deal with this professionally (or used to). When your head is in graphics mode, text becomes objects, spelling becomes cognitively invisible. It's a clear case where A.I. should have a natural, useful advantage as a reviewing tool. So I showed the image to ChatGPT, and it missed it completely (ha ...just one funny example; it doesn't invalidate the concept).
• And the section (not in your image but on the web page) about the seasons, just doesn't belong here. It's not significant to understanding RA and Dec. That's an editing error.

Frank Reed