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Đồng Hới

17.469° N   106.622° E  ·  9 M
66 /100
PEAK
Worth setting up — 5 hours of workable sky from 23:00.
BEST WINDOW 23:00–04:00 · ASTRO DARK 23:00–05:00 · MOON 0%
Transparency
0.63
Seeing
0.49
Cloud
13%
Moon
0%

Good tonight

Hour by hour, local to Đồng Hới. 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
66
52
48
47
43
34
9
0
BEST WINDOW
Low cloud
3%
3%
6%
19%
32%
50%
46%
54%
Mid cloud
6%
14%
12%
12%
11%
7%
2%
0%
High cloud
3%
21%
32%
17%
6%
1%
4%
6%
Transparency
0.63
0.59
0.57
0.57
0.57
0.57
0.56
0.55
Seeing
0.43
0.36
0.37
0.41
0.49
0.49
0.47
0.45
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 Good · 66/100
Starting from
100
Cloud
−10
Transparency
−13
Seeing
−11
Moonlight
−0
Darkness
−0
Score
66
CLOUD 13% LOW 3% MID 6% HIGH 3% SUN -54.5° MOON -53.1° / 0% WIND 8 TEMP 30°
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 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 52

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

23010305
TWILIGHT BEGINS 05:00
SET UP 22:30 · OBSERVE 23:00–04:00 · 5H · MEAN 47

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

23010305
SEEING STAYS SOFT THROUGHOUTMOONLIGHT IGNORED FOR THIS TARGET
SET UP 22:30 · OBSERVE 23:00–05:00 · 6H · MEAN 50

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

23010305
TWILIGHT BEGINS 05:00
SET UP 22:30 · OBSERVE 23:00–03:00 · 4H · MEAN 44

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

23010305
SET UP 22:30 · OBSERVE 23:00–04:00 · 5H · MEAN 57

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

23010305
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The next week of nights

Tonight · 12 Aug
66
Good
MOON 0%
23:00–04:00
Tomorrow · 13 Aug
35
Fair
MOON 1%
20:00–21:00
Friday · 14 Aug
32
Poor
MOON 5%
Saturday · 15 Aug
6
Clouded out
MOON 10%
Sunday · 16 Aug
7
Clouded out
MOON 19%
Monday · 17 Aug
41
Fair
MOON 28%
01:00–02:00
Tuesday · 18 Aug
26
Poor
MOON 37%
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About this forecast

Conditions for Đồng Hới, 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 →