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Sông Cầu

13.456° N   109.224° E  ·  10 M
62 /100
PEAK
Worth setting up — 3 hours of workable sky from 02:00.
BEST WINDOW 02:00–05:00 · ASTRO DARK 23:00–05:00 · MOON 0%
Transparency
0.54
Seeing
0.75
Cloud
20%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
23
00
01
02
03
04
05
06
31
30
30
56
62
54
7
0
BEST WINDOW
Low cloud
13%
16%
31%
17%
13%
16%
25%
58%
Mid cloud
1%
0%
0%
1%
8%
16%
10%
15%
High cloud
91%
95%
76%
17%
0%
0%
22%
16%
Transparency
0.54
0.53
0.52
0.53
0.53
0.53
0.52
0.52
Seeing
0.58
0.64
0.69
0.69
0.75
0.75
0.72
0.71
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
23 Poor · 31/100
Starting from
100
Cloud
−57
Transparency
−8
Seeing
−4
Moonlight
−0
Darkness
−0
Score
31
CLOUD 92% LOW 13% MID 1% HIGH 91% SUN -59.1° MOON -57.8° / 0% WIND 6 TEMP 29°
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 02:00–05:00 · 3H · MEAN 59

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

23010305
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 05:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 60

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

23010305
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 05:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 57

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

23010305
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 05:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 46

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

23010305
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 05:00
SET UP 01:30 · OBSERVE 02:00–05:00 · 3H · MEAN 60

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

23010305
HIGH CLOUD CLEARS 02:00CLOUD RETURNS 05:00
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The next week of nights

Tonight · 12 Aug
62
Good
MOON 0%
02:00–05:00
Tomorrow · 13 Aug
49
Fair
MOON 1%
20:00–21:00
Friday · 14 Aug
50
Fair
MOON 5%
20:00–22:00
Saturday · 15 Aug
5
Clouded out
MOON 10%
Sunday · 16 Aug
6
Clouded out
MOON 19%
Monday · 17 Aug
2
Clouded out
MOON 28%
Tuesday · 18 Aug
4
Clouded out
MOON 37%
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Nearby locations

About this forecast

Conditions for Sông Cầu, Vietnam 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 →