Observing conditions

The table below summarises the observation conditions at the Épendes Observatory site.

Légende

Icom	Definition
	Cloud cover Blue is for clear while white is for cloud. e.g. the disk on the left is 0% cloud while the one on the right is 100% cloud.
	Astronomical seeing From left to right: <0.5", 0.5"-0.75", 0.75"-1", 1"-1.25", 1.25"-1.5", 1.5"-2", 2"-2.5", >2.5" (unit: arcsecond). In short, the smaller/bluer, the better the seeing condition is.
	Atmospheric transparency From left to right: <0.3, 0.3-0.4, 0.4-0.5, 0.5-0.6, 0.6-0.7, 0.7-0.85, 0.85-1, >1 (unit: mag per air mass). In short, the fewer bars/bluer, the better the transparency is.
	Humidity From left to right: relative humidity 80%-90%, 90%-95%, and over 95%.
	Precipitation expected (rain or snow)
	Atmospheric instability From left to right: lifted index between 0 to -3, -3 to -5, and below -5.
	Windy weather warning From left to right: sustained wind speed between 8.0-10.8m/s (fresh), 10.8-17.2m/s (strong), and over 17.2m/s (gale or above).

The above data is provided free of charge by 7timer.