Time in Windows and Linux

By default, Windows assumes that the local system clock is set to local time, and updates it accordingly. Ubuntu Linux assumes that the clock is running UTC (essentially Greenwich Mean Time) and will update it on that assumption. Since it knows your location (you specified it at installation, and hopefully updated it when you moved) it will display the correct local time just like windows.

The problem comes when you have a dual boot (Linux and Windows) system. When you reboot from one OS into the other the new OS will assume the system clock is behaving according its own rules, even though the other OS was following its rules. To fix this:

Continue reading

Rang Gaeilge, 15ú lá Mí na Bealtaine 2022

Duinnín agus Imleacán Kali (tuilleadh)

Dineen and the navel of Kali (continued)
  • Lig Brady osna as, ach thug sé an treoir chuí do phóilín a bhí ar dualgas.

    Brady sighed,but he gave the appropriate direction to a police officer on duty.

    treoir Guidance, direction f
    cuí Fitting, proper
    dualgas Natural right, due; customary fee or reward
    ar dualgas on duty
  • Léigh tuilleadh

Free42 on Ubuntu

As I mentioned in Slackware Diary, I installed Free42 As I wrote in 2006 I fell in love with HP calculators and their RPN notation back in the 1970s, and still find the conventional algebraic notation rather awkward. I no longer carry a physical calulator, but I have Free42 installed on my phone and my tablet, and on my Windows systems. Now I also have it on Slackware. So I circled back to see if I could install in on Ubuntu.

Continue reading

Electrons and Positrons

I have known about Electron–positron annihilation for at least 52 years, from my course in Atomic and Nuclear Physics at Carleton College in the spring of 1970 if not before. The reaction is

e + e+ → γ + γ

I had always assumed that the inverse reaction

γ + γ → e + e+

was also possible because of time reversal symmetry. Apparently so had everyone else, but it has only recently been observed: Matter arises from light? We finally know the answer to this question!. Even now there is a caveat about “virtual” as opposed to “real” photons.

Slackware Diary – 2

Continuing from Slackware Diary – 1

Fixed the prompt by copying .bashrc and .profile (renamed as .bash_profile) from my primary Ubuntu system. This works and I have nice color prompts in Slackware. Need to see if I have scripts from my previous Slackware days to add environment variables, aliases, etc. Life in Slackware means a lot of time on the command line.

The next task on my list was to install Flatpak so I could use apps from Flathub

“Failure is always an option.”-Adam Savage