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Goiana

-7.561° S   35.002° W  ·  21 M
69 /100
PEAK
Worth setting up — 9 hours of workable sky from 19:00.
BEST WINDOW 19:00–04:00 · ASTRO DARK 19:00–05:00 · MOON 0%
Transparency
0.49
Seeing
0.94
Cloud
4%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
17
18
19
20
21
22
23
00
01
02
03
04
05
06
0
24
66
59
43
51
45
49
55
69
36
13
7
0
BEST WINDOW
Low cloud
20%
9%
10%
20%
41%
29%
38%
30%
23%
4%
49%
82%
46%
41%
Mid cloud
1%
1%
1%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
High cloud
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Transparency
0.55
0.49
0.45
0.41
0.40
0.38
0.35
0.33
0.35
0.34
0.32
0.41
0.41
0.42
Seeing
0.67
0.75
0.80
0.82
0.84
0.85
0.86
0.84
0.84
0.92
0.94
0.92
0.92
0.91
Moon clear
0%
down
down
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down
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down
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down
down
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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
17 Clouded out · 0/100
Starting from
100
Cloud
−20
Transparency
−14
Seeing
−5
Moonlight
−0
Darkness
−60
Score
0
CLOUD 20% LOW 20% MID 1% HIGH 0% SUN 4.1° MOON 6.9° / 0% WIND 5 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 18:30 · OBSERVE 19:00–04:00 · 9H · MEAN 54

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

17192123010305
ASTRONOMICAL DARK FROM 19:00CLOUD RETURNS 04:00
SET UP 17:30 · OBSERVE 18:00–04:00 · 10H · MEAN 59

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

17192123010305
CLOUD RETURNS 04:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 18:30 · OBSERVE 19:00–04:00 · 9H · MEAN 51

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

17192123010305
ASTRONOMICAL DARK FROM 19:00CLOUD RETURNS 04:00
SET UP 23:30 · OBSERVE 00:00–03:00 · 3H · MEAN 45

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

17192123010305
CLOUD RETURNS 03:00
SET UP 18:30 · OBSERVE 19:00–03:00 · 8H · MEAN 57

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

17192123010305
ASTRONOMICAL DARK FROM 19:00CLOUD RETURNS 03:00
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The next week of nights

Tonight · 12 Aug
69
Good
MOON 0%
19:00–04:00
Tomorrow · 13 Aug
75
Excellent
MOON 3%
19:00–05:00
Friday · 14 Aug
74
Good
MOON 7%
19:00–04:00
Saturday · 15 Aug
69
Good
MOON 15%
03:00–04:00
Sunday · 16 Aug
58
Good
MOON 23%
03:00–04:00
Monday · 17 Aug
62
Good
MOON 32%
03:00–04:00
Tuesday · 18 Aug
53
Fair
MOON 42%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Goiana, Brazil 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 →