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Loma Plata

-22.383° S   59.836° W  ·  133 M
89 /100
PEAK
A genuinely good night — 5 hours of clear, dark sky from 20:00.
BEST WINDOW 20:00–01:00 · ASTRO DARK 20:00–07:00 · MOON 0%
Transparency
0.78
Seeing
1.00
Cloud
4%
Moon
0%

Excellent tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
19
20
21
22
23
00
01
02
03
04
05
06
07
08
0
89
82
79
74
51
33
31
43
34
30
36
2
0
BEST WINDOW
Low cloud
0%
0%
0%
0%
0%
0%
0%
0%
2%
4%
9%
2%
5%
9%
Mid cloud
0%
0%
0%
0%
0%
1%
15%
36%
36%
25%
9%
18%
7%
6%
High cloud
8%
4%
10%
11%
16%
63%
91%
70%
24%
72%
92%
74%
71%
64%
Transparency
0.80
0.78
0.70
0.60
0.54
0.51
0.47
0.47
0.49
0.52
0.48
0.46
0.45
0.46
Seeing
1.00
1.00
0.96
0.98
0.96
0.89
0.87
0.84
0.78
0.73
0.72
0.73
0.78
0.81
Moon clear
down
down
down
down
down
down
down
down
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
19 Clouded out · 0/100
Starting from
100
Cloud
−4
Transparency
−8
Seeing
−0
Moonlight
−0
Darkness
−88
Score
0
CLOUD 8% LOW 0% MID 0% HIGH 8% SUN -4.6° MOON -0.4° / 0% WIND 2 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 19:30 · OBSERVE 20:00–01:00 · 5H · MEAN 74

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

19212301030507
ASTRONOMICAL DARK FROM 20:00CLOUD RETURNS 01:00
SET UP 19:30 · OBSERVE 20:00–01:00 · 5H · MEAN 80

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

19212301030507
ASTRONOMICAL DARK FROM 20:00CLOUD RETURNS 01:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 19:30 · OBSERVE 20:00–01:00 · 5H · MEAN 69

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

19212301030507
ASTRONOMICAL DARK FROM 20:00CLOUD RETURNS 01:00
SET UP 19:30 · OBSERVE 20:00–00:00 · 4H · MEAN 70

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

19212301030507
ASTRONOMICAL DARK FROM 20:00CLOUD RETURNS 00:00
SET UP 19:30 · OBSERVE 20:00–01:00 · 5H · MEAN 75

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

19212301030507
ASTRONOMICAL DARK FROM 20:00CLOUD RETURNS 01:00
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The next week of nights

Tonight · 12 Aug
89
Excellent
MOON 0%
20:00–01:00
Tomorrow · 13 Aug
80
Excellent
MOON 3%
20:00–01:00
Friday · 14 Aug
75
Excellent
MOON 7%
20:00–04:00
Saturday · 15 Aug
74
Good
MOON 15%
21:00–22:00
Sunday · 16 Aug
82
Excellent
MOON 23%
03:00–04:00
Monday · 17 Aug
47
Fair
MOON 32%
21:00–22:00
Tuesday · 18 Aug
22
Poor
MOON 42%
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Nearby locations

About this forecast

Conditions for Loma Plata, Paraguay 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 →