GoodSeeing
Home › Locations › Datun

Datun

34.809° N   116.902° E  ·  58 M
16 /100
PEAK
Nothing usable opens up tonight.
NO USABLE WINDOW · ASTRO DARK 01:00–04:00 · MOON 0%
Transparency
0.22
Seeing
0.89
Cloud
84%
Moon
0%

Poor tonight

Hour by hour, local to Datun. Colour encodes the score and nothing else; every other measurement is luminance.

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
01
02
03
04
05
06
7
16
16
6
0
0
Low cloud
12%
0%
2%
0%
8%
7%
Mid cloud
96%
81%
83%
100%
100%
95%
High cloud
21%
21%
3%
0%
0%
0%
Transparency
0.22
0.22
0.22
0.21
0.21
0.20
Seeing
0.85
0.84
0.88
0.89
0.89
0.85
Moon clear
down
down
down
down
down
0%
Inspect

Cloud tracks show clear sky — a longer bar is better. The figure inside each track is the raw measurement.

Why this hour scored what it did
01 Clouded out · 7/100
Starting from
100
Cloud
−89
Transparency
−3
Seeing
−0
Moonlight
−0
Darkness
−0
Score
7
CLOUD 97% LOW 12% MID 96% HIGH 21% SUN -39.2° MOON -38.5° / 0% WIND 4 TEMP 23°
Excellent 75+ Good 55+ Fair 35+ Poor 15+ Not worth it Seeing is estimated from surface wind — see how we score.

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.

NO USABLE WINDOW FOR THIS TARGET TONIGHT

Darkness and moonlight dominate. Faint fuzzies need a genuinely dark sky more than they need steady air.

010305
CLOUD NEVER DROPS BELOW 84%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

Seeing is everything and moonlight is irrelevant. Bright targets punch through twilight, so darkness barely counts.

010305
CLOUD NEVER DROPS BELOW 84%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

Tolerates soft seeing, but high cloud wrecks a wide frame and moonlight raises the background everywhere.

010305
CLOUD NEVER DROPS BELOW 84%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

Needs conditions to hold still for hours. Sustained transparency matters more than any single good hour.

010305
CLOUD NEVER DROPS BELOW 84%
NO USABLE WINDOW FOR THIS TARGET TONIGHT

Naked eye, whole sky. Total cloud and moonlight are the only things that count.

010305
CLOUD NEVER DROPS BELOW 84%
Advertisement
Reserved

The next week of nights

Tonight · 12 Aug
16
Poor
MOON 0%
Tomorrow · 13 Aug
57
Good
MOON 1%
23:00–03:00
Friday · 14 Aug
43
Fair
MOON 5%
21:00–23:00
Saturday · 15 Aug
55
Good
MOON 10%
02:00–03:00
Sunday · 16 Aug
36
Fair
MOON 19%
02:00–03:00
Monday · 17 Aug
32
Poor
MOON 28%
Tuesday · 18 Aug
67
Good
MOON 37%
02:00–03:00
Advertisement
Reserved

Nearby locations

About this forecast

Conditions for Datun, 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 →