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Lahat

-3.785° S   103.543° E  ·  115 M
77 /100
PEAK
A genuinely good night — 5 hours of clear, dark sky from 01:00.
BEST WINDOW 01:00–06:00 · ASTRO DARK 01:00–06:00 · MOON 0%
Transparency
0.52
Seeing
0.95
Cloud
0%
Moon
0%

Excellent tonight

Hour by hour, local to Lahat. 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
77
56
56
55
36
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
2%
3%
Mid cloud
0%
0%
0%
0%
0%
0%
High cloud
0%
51%
49%
52%
95%
94%
Transparency
0.52
0.48
0.46
0.44
0.43
0.42
Seeing
0.83
0.90
0.95
0.93
0.94
0.96
Moon clear
down
down
down
down
down
down
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 Excellent · 77/100
Starting from
100
Cloud
−0
Transparency
−19
Seeing
−3
Moonlight
−0
Darkness
−0
Score
77
CLOUD 0% LOW 0% MID 0% HIGH 0% SUN -73.6° MOON -74.3° / 0% WIND 4 TEMP 24°
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
Why thin high cloud ruins long exposures

Cirrus you can barely see will halo your bright stars, lift your background and vary between frames. Visual observers shrug it off. Long exposures integrate it, so it accumulates.

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 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 60

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

010305
CLOUD RETURNS 05:00
SET UP 00:30 · OBSERVE 01:00–06:00 · 5H · MEAN 61

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

010305
TWILIGHT BEGINS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 53

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

010305
CLOUD RETURNS 05:00
SET UP 00:30 · OBSERVE 01:00–04:00 · 3H · MEAN 47

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

010305
SET UP 00:30 · OBSERVE 01:00–05:00 · 4H · MEAN 60

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

010305
CLOUD RETURNS 05:00
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The next week of nights

Tonight · 12 Aug
77
Excellent
MOON 0%
01:00–06:00
Tomorrow · 13 Aug
52
Fair
MOON 1%
20:00–06:00
Friday · 14 Aug
74
Good
MOON 5%
01:00–06:00
Saturday · 15 Aug
35
Fair
MOON 10%
01:00–02:00
Sunday · 16 Aug
31
Poor
MOON 19%
Monday · 17 Aug
69
Good
MOON 28%
01:00–02:00
Tuesday · 18 Aug
34
Poor
MOON 37%
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Nearby locations

About this forecast

Conditions for Lahat, 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 →