Bonan
PEAK
Fair tonight
Hour by hour, local to Bonan. Colour encodes the score and nothing else; every other measurement is luminance.
Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.
Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.
What are you doing tonight?
The same forecast, weighted for the target. Planetary work barely cares about moonlight; long exposures die on high cloud a visual observer would never notice.
Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.
Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.
Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.
Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.
Naked eye, whole sky. Total cloud and moonlight are the only things that count.
The next week of nights
01:00–02:00
22:00–00:00
Nearby locations
About this forecast
Conditions for Bonan, China are computed from the MET Norway forecast model for these exact coordinates, combined with sun and moon positions we calculate directly. The score weighs cloud cover by layer, atmospheric transparency, estimated seeing, moonlight and how dark the sky actually gets. Read the full method →