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Gemini Links 09/12/2025: Lunar Observations and Programming

Posted by Roy Schestowitz on Dec 09, 2025

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• Gemini* and GopherPersonal/OpinionsTechnology and Free SoftwareProgramming

* ### Gemini* and Gopher

Personal/Opinions

🔤SpellBinding: EINSTUX Wordo: TRUCK

Lunar Observations 2025-12-08

I woke up a little earlier than usual this morning and realized that I could spare about 30 minutes or so for some stargazing. The moon was high and bright, so instead of stargazing I decided to focus on lunar observing. I broke out my old Jupiter 60-AZ and took it out in the front yard. The mount on the 60-AZ has some serious issues, but it is still workable enough for lunar observations. The temperature was cold at -21 ℉, but after putting on my Bat Thermal Underwear™ and three other layers of clothing, I was able to stay warm enough.Sketching the moon is not practical for me — there is too much detail involved, and I don't have enough time for it, usually having only about 30 minutes or so out in the freezing cold. But I can learn a lot by taking notes. For this, I set out a small table next to the telescope, and I laid out my Cambridge Atlas 3rd ed. Iopened up to the moon map on page 2, trying to make some identifications, which I noted down in my notebook right after coming back inside. I got back inside about 5:20am, after about 30 minutes of observing.The area I focused my observations on were near the terminator line, which I believe was just a little past 50 deg E. More specifically, I focused on the craters E of Mare Nectaris, and also the non-mare area that sits in-between M. Nectaris, M. Fecunditatis, and M. Tranquillitatis. The moon seemed too fuzzy with the medium magnification lens, so I stuck with the low magnification lens most of the time.

Technology and Free Software

Programming

Call by value but the value is two pointers

With push! from miscmacros you can cons onto that particular name whereas with mutate-cons! defined like this:

(define (mutate-cons! val lis)

(set-cdr! lis (cons (car lis) (cdr lis)))

(set-car! lis val))

You can change all instances of that particular list. Super dangerous.♥︎

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