WEATHER

Weather and Seeing Conditions

Clear Sky Clock
(If the Clear Sky Clock is on a prior date, clear your history and it will update)

The darkness level in the Clear Sky Clock takes the altitude of both the sun and moon, as well as the phase of the moon, into account.

Normally, for the altitude of the Sun or Moon at SRO, just hover over the darkness cells of the Clear Sky Clock. However, it will not work on the directed link above. For this function, you need to directly connect the Clear Sky Clock, which you can do through the button below:

SRO Clear Sky Clock Link

Primary Alcor Seeing Monitor
The Alcor seeing monitor begins at about 10:15 PM in summer and about 8 PM in the winter, specifically at the end of Astronomical Twilight (beginning of Astronomical Darkness), when the sun is 18 degrees below the horizon. During the day this number represents the mean seeing for the previous night. During the evening, this number represents the current mean seeing for that evening.

Current Mean Seeing and Graphic
Primary Cyclope Seeing Monitor