This page. A click on the thumbnail on top left of the page brings up the main page.
The light spectrum listed from IR to UV and how humans perceive colours.
The weather in CH-3952 Susten. Since 1993, I have been recording barometric pressure, temperature, humidity and wind each 30 minutes.
- the angle of view from the focal length of a lens of a DX and FX DSLR camera,
- the size of panoramas in different projections.