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Tianpeng

30.987° N   103.939° E  ·  611 M
68 /100
PEAK
Worth setting up — 4 hours of workable sky from 02:00.
BEST WINDOW 02:00–06:00 · ASTRO DARK 00:00–06:00 · MOON 0%
Transparency
0.56
Seeing
1.00
Cloud
17%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
00
01
02
03
04
05
06
07
52
16
56
35
61
68
3
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
Mid cloud
36%
88%
33%
63%
27%
17%
24%
16%
High cloud
2%
1%
0%
0%
0%
0%
0%
0%
Transparency
0.46
0.46
0.52
0.56
0.54
0.51
0.49
0.46
Seeing
0.96
0.92
0.94
0.95
0.96
1.00
1.00
1.00
Moon clear
down
down
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
00 Fair · 52/100
Starting from
100
Cloud
−33
Transparency
−14
Seeing
−1
Moonlight
−0
Darkness
−0
Score
52
CLOUD 37% LOW 0% MID 36% HIGH 2% SUN -41.1° MOON -39.8° / 0% WIND 2 TEMP 25°
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.

SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 55

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

00020406
CLOUD BREAKS 02:00TWILIGHT BEGINS 06:00
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 62

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

00020406
CLOUD BREAKS 02:00TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 62

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

00020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 06:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 52

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

00020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 06:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 65

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

00020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
68
Good
MOON 0%
02:00–06:00
Tomorrow · 13 Aug
81
Excellent
MOON 1%
22:00–06:00
Friday · 14 Aug
76
Excellent
MOON 5%
22:00–06:00
Saturday · 15 Aug
9
Clouded out
MOON 10%
Sunday · 16 Aug
1
Clouded out
MOON 19%
Monday · 17 Aug
49
Fair
MOON 28%
02:00–03:00
Tuesday · 18 Aug
4
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for Tianpeng, 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 →