Latest posts
- Technical note: transfer files over an ethernet patch cableAug 29, 2026
It's possible to just connect two computers together with Ethernet and do a bit of IP configuration: # On sender ... ip address add dev eth0 fd42:dead:beef::1/48 ip link set dev eth0 up # On receiver ... ip address add dev eth0 fd42:dead:beef::2/48 ip link set dev eth0 up After a few seconds, pings should work: # On receiver ... ping fd42:dead:beef::1 ... and so should this: #
- Uranium from Příbram (Czechia)Aug 25, 2026
All images are links to high quality versions. RC-102: 1.7 kCPS [43 uSv/h]. AB+: 55 CPS, 1960 CPS RC-102: 1.1 kCPS [37 uSv/h] It has nice botryoidal formations of massive Uraninite along with some areas where the shape of the underlying calcite crystal is visible. A few of the "bubbles" are broken, showing the individual crystals that grew on the matrix. RC-102:
- You have been mislead about lightbulbsJul 30, 2026
There's a story that goes something like this: This is true. This is true. This isn't quite right, but it's the type of wrong that cites its sources and hides in the part you'd never think to fact check: In truth, increasing the lifespan of a bulb makes it worse in every other way... but people think they want a long lasting lightbulb: the purpose of standardizing was (primarily) to avoid
- Regressive JPEGs:Jul 17, 2026
One of the cool features of JPEG files is that there's the option to save low frequency components first. This means that a partially downloaded image will be displayed at low resolution instead of being cut off. FF DA - "start of scan" marker 00 0C - Big endian length field (12 bytes) Includes itself 03 - Number of channels in scan (3) 01 - Global id of first included channel 00 - Hu
- NGC 7497, etc.Jul 16, 2026
North is up (aprox). 0.53 "/pixel. [24' x 23' field] FWHM = 3.75" A relatively unremarkable spiral galaxy... but hey, what's that in the background? var current = false; function change() { current = !current; document.getElementById("notes").src = current?"/astro/ngc7497/notes.jpg":"/astro/ngc7497/small.jpg"; } Click to toggle annotations. (needs JS) Well, it's not actually in the b