GoodSeeing
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Sīrē

8.317° N   39.483° E  ·  1755 M
55 /100
PEAK
Worth setting up — 1 hour of workable sky from 05:00.
BEST WINDOW 05:00–06:00 · ASTRO DARK 21:00–06:00 · MOON 0%
Transparency
0.37
Seeing
0.84
Cloud
27%
Moon
0%

Good tonight

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

Sky state
Lighter = daylight and twilight  ·  unshaded = astronomical dark
Score
21
22
23
00
01
02
03
04
05
06
51
33
29
19
19
5
5
11
55
0
BEST WINDOW
Low cloud
3%
11%
16%
5%
9%
62%
34%
4%
2%
3%
Mid cloud
20%
19%
23%
52%
36%
67%
88%
88%
17%
64%
High cloud
13%
59%
60%
79%
91%
91%
69%
38%
13%
19%
Transparency
0.32
0.25
0.29
0.30
0.10
0.10
0.10
0.31
0.37
0.41
Seeing
0.77
0.78
0.68
0.71
0.83
0.84
0.81
0.78
0.79
0.83
Moon clear
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
21 Fair · 51/100
Starting from
100
Cloud
−26
Transparency
−20
Seeing
−3
Moonlight
−0
Darkness
−0
Score
51
CLOUD 32% LOW 3% MID 20% HIGH 13% SUN -33.6° MOON -31.7° / 0% WIND 4 TEMP 18°
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
When a clear gap is worth driving for

Ask how long the gap is relative to your setup time and your exposure length. A two-hour gap is a real session for a visual observer and close to worthless for someone doing four-minute subs on a target that needs three hours.

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 04:30 · OBSERVE 05:00–06:00 · 1H · MEAN 56

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

2123010305
HIGH CLOUD CLEARS 05:00CLOUD RETURNS 06:00
SET UP 20:30 · OBSERVE 21:00–23:00 · 2H · MEAN 47

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

2123010305
SEEING DEGRADES AFTER 23:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 04:30 · OBSERVE 05:00–06:00 · 1H · MEAN 52

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

2123010305
HIGH CLOUD CLEARS 05:00CLOUD RETURNS 06:00
SET UP 04:30 · OBSERVE 05:00–06:00 · 1H · MEAN 41

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

2123010305
HIGH CLOUD CLEARS 05:00CLOUD RETURNS 06:00
SET UP 04:30 · OBSERVE 05:00–06:00 · 1H · MEAN 57

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

2123010305
HIGH CLOUD CLEARS 05:00CLOUD RETURNS 06:00
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The next week of nights

Tonight · 12 Aug
55
Good
MOON 0%
05:00–06:00
Tomorrow · 13 Aug
56
Good
MOON 2%
20:00–02:00
Friday · 14 Aug
47
Fair
MOON 6%
20:00–22:00
Saturday · 15 Aug
70
Good
MOON 13%
21:00–22:00
Sunday · 16 Aug
68
Good
MOON 21%
21:00–22:00
Monday · 17 Aug
59
Good
MOON 30%
21:00–22:00
Tuesday · 18 Aug
66
Good
MOON 39%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Sīrē, Ethiopia 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 →