Tonight’s sky, and why.
The Sky Quality Index (SQI) below is predicted from the current heuristic. Log what you actually see tonight so we can tell where it’s right and where it isn’t.
SQI and its Low–Exceptional tiers are experimental and still being calibrated against real observations — treat scores as a starting point, not a verdict.
Updated Sep 8, 11:57 PM · stargazing scored ~2hr after sunset
Tuesday, September 8(tonight’s window has passed)
Sunset 07:44 PM · Stargazing ~9:44 PMSunset SQI
52.4Fair conditions
- only 0% high cloud cover -- likely a plain sky with little to catch color
Stargazing SQI
91.9Exceptional conditions
- total cloud cover is low (0%) -- mostly open sky
Tonight
Sunset 07:42 PM · Stargazing ~9:42 PMSunset SQI
67.8Good conditions
- 100% high cloud cover is heavy enough it may mute the display
Stargazing SQI
0Low conditions
- sky cover is heavy enough that it's essentially fully obscured -- moon phase and air clarity don't matter if the sky itself isn't visible
Thursday, September 10
Sunset 07:41 PM · Stargazing ~9:41 PMSunset SQI
50.4Fair conditions
- only 0% high cloud cover -- likely a plain sky with little to catch color
Stargazing SQI
86.9Great conditions
- total cloud cover is low (6%) -- mostly open sky