@mattblaze @xenotar @SteveBellovin For comparison, I had to look up the specs on my Celestron 11” Schmidt-Cassegrain telescope: f/10 and a 2800 mm focal length. The optics weigh in at 27.5 lbs.
Notices by Schamschula (schamschula@mastodon.social)
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Schamschula (schamschula@mastodon.social)'s status on Sunday, 03-May-2026 10:32:42 JST
Schamschula
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Schamschula (schamschula@mastodon.social)'s status on Tuesday, 24-Mar-2026 05:08:16 JST
Schamschula
@thomasfuchs @glennf Sure you may have full heat output down to 5°F. However, the thermodynamic balance point typically is somewhere between 10 and 20°F. This is the point where the heat pump, i.e. the heat engine running in reverse, requires more energy than a resistive heating element to heat the air. The second law of thermodynamics seems always to get in the way!
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Schamschula (schamschula@mastodon.social)'s status on Tuesday, 24-Mar-2026 04:42:44 JST
Schamschula
@thomasfuchs @glennf Implying that heat pumps don't work was obviously was not my intention! As a physics professor, I know about thermodynamics. I was trying to point out that heat pumps are best suited to work as air conditioners and as heat for milder climates. In colder climates you may want a combination system that switches to a furnace when it gets cold.
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Schamschula (schamschula@mastodon.social)'s status on Tuesday, 24-Mar-2026 04:23:21 JST
Schamschula
@glennf @thomasfuchs Using a heat pump to heat is OK in a temperate climate. However, here in the Southeast we tend to have several cold snaps every year. By cold snap I mean when temperatures go below 20F. At this point an air-2-air heat pump (as opposed to a "geothermal" ground-2-air heat pump) cannot extract enough energy from the outside air to heat the building. I found this out the hard way when the circuit breaker for the resistive heating element failed.
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Schamschula (schamschula@mastodon.social)'s status on Saturday, 31-Aug-2024 02:50:52 JST
Schamschula
@lina As a MacPorts maintainer and a FreeBSD sysadmin, I run into two problems with rust:
1) It is unwieldy to maintain rust and cargo, so both are often out of date on MacPorts.
2) On FreeBSD some random library (e.g. librsvg) that depends on rust/cargo causes Poudriere to rebuild rust every time some build dependency is updated. This usually takes several hours on my build machine. For this reason, and that it adds a lot of extra packages, MacPorts still doesn't use librsvg built using rust. -
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Schamschula (schamschula@mastodon.social)'s status on Wednesday, 13-Sep-2023 07:03:08 JST
Schamschula
@thomasfuchs The initial betas for Xcode worked perfectly, but more recent betas have introduced a incompatibility or two under MacPorts, e.g. librsvg.
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Schamschula (schamschula@mastodon.social)'s status on Saturday, 24-Dec-2022 22:21:19 JST
Schamschula
@cyberspook @Suiseiseki Not arrogant. They have been saying GNU/Linux is coming on the desktop for how many years? I’ve got three #raspberry_pi machines for data acquisition. The GUI is acceptable for system administration. However, I happen to prefer an OS that allows me to get work done.
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Schamschula (schamschula@mastodon.social)'s status on Saturday, 24-Dec-2022 17:00:19 JST
Schamschula
@Suiseiseki So I guess you’re using Linux as your desktop. Sorry!
P.S. I don’t feed trolls.
Please do a little more research before dissing my choices. My contributions to OSS go back to the 1990s.
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Schamschula (schamschula@mastodon.social)'s status on Friday, 23-Dec-2022 22:26:10 JST
Schamschula
@Suiseiseki I well aware of that! However, I have no interest in wasting my time using Byzantine keystroke based pseudo GUI editors like Vim or Emacs. I left those behind when I went from DOS 2.1 and Editix/Wordix to the Mac in 1987.
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Schamschula (schamschula@mastodon.social)'s status on Friday, 23-Dec-2022 22:04:28 JST
Schamschula
@nixCraft nano for quick edits, #bbedit for everything else!