N. Copernicus Observatory and Planetarium in Brno:
Theoretical clear-sky natural horizontal illuminances by Sun (with
its angular heights 0, -6, -12 and -18 degrees marked)
and Moon, and of measured data. Temperatures, pressure, precipitation
and wind are shown too, eventually. With new data plotted at the top,
the graphs are aligned right-to-left, so that almost continuous curves appear
(using axes where time increases to the right as usual).
light and weather overview