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Tuban

-8.743° S   115.172° E  ·  7 M
48 /100
PEAK
Marginal, but there is a 2 hours gap from 04:00.
BEST WINDOW 04:00–06:00 · ASTRO DARK 02:00–06:00 · MOON 0%
Transparency
0.27
Seeing
0.80
Cloud
19%
Moon
0%

Fair tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
02
03
04
05
06
07
34
24
40
48
9
0
BEST WINDOW
Low cloud
45%
60%
37%
26%
19%
32%
Mid cloud
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
Transparency
0.10
0.10
0.21
0.24
0.27
0.29
Seeing
0.80
0.77
0.73
0.70
0.70
0.73
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
02 Poor · 34/100
Starting from
100
Cloud
−45
Transparency
−20
Seeing
−2
Moonlight
−0
Darkness
−0
Score
34
CLOUD 45% LOW 45% MID 0% HIGH 0% SUN -65.9° MOON -67.4° / 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.
Tonight's limiting factor
Conditions for planets and the Moon

Seeing is everything. Darkness and moonlight barely matter, and a hazy, humid night that ruins deep-sky work is often the steadiest night of the year for planetary detail.

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 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 46

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

020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 06:00
SET UP 03:30 · OBSERVE 04:00–07:00 · 3H · MEAN 47

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

020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 07:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 44

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

020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 06:00
SET UP 04:30 · OBSERVE 05:00–06:00 · 1H · MEAN 36

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

020406
TWILIGHT BEGINS 06:00
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 48

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

020406
CLOUD BREAKS 04:00TWILIGHT BEGINS 06:00
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The next week of nights

Tonight · 12 Aug
48
Fair
MOON 0%
04:00–06:00
Tomorrow · 13 Aug
58
Good
MOON 1%
20:00–03:00
Friday · 14 Aug
56
Good
MOON 5%
20:00–22:00
Saturday · 15 Aug
49
Fair
MOON 10%
20:00–21:00
Sunday · 16 Aug
50
Fair
MOON 19%
20:00–21:00
Monday · 17 Aug
61
Good
MOON 28%
20:00–21:00
Tuesday · 18 Aug
57
Good
MOON 37%
20:00–21:00
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Nearby locations

About this forecast

Conditions for Tuban, Indonesia 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 →