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Ch’ench’a

6.250° N   37.567° E  ·  2739 M
45 /100
PEAK
Marginal, but there is a 3 hours gap from 03:00.
BEST WINDOW 03:00–06:00 · ASTRO DARK 21:00–06:00 · MOON 0%
Transparency
0.29
Seeing
1.00
Cloud
32%
Moon
0%

Fair tonight

Hour by hour, local to Ch’ench’a. 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
07
2
0
0
12
17
33
36
45
42
2
0
BEST WINDOW
Low cloud
49%
82%
81%
16%
23%
21%
16%
19%
21%
23%
16%
Mid cloud
98%
100%
100%
83%
69%
37%
32%
20%
14%
39%
16%
High cloud
29%
19%
23%
8%
2%
5%
15%
6%
7%
31%
42%
Transparency
0.19
0.18
0.19
0.19
0.21
0.24
0.27
0.29
0.10
0.25
0.26
Seeing
0.94
0.96
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Moon clear
down
down
down
down
down
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
21 Clouded out · 2/100
Starting from
100
Cloud
−97
Transparency
−1
Seeing
−0
Moonlight
−0
Darkness
−0
Score
2
CLOUD 99% LOW 49% MID 98% HIGH 29% SUN -32.7° MOON -30.8° / 0% WIND 3 TEMP 11°
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 02:30 · OBSERVE 03:00–06:00 · 3H · MEAN 41

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

212301030507
CLOUD RETURNS 06:00
SET UP 01:30 · OBSERVE 02:00–06:00 · 4H · MEAN 49

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

212301030507
CLOUD BREAKS 02:00CLOUD RETURNS 06:00MOONLIGHT IGNORED FOR THIS TARGET
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 40

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

212301030507
CLOUD RETURNS 06:00
NO USABLE WINDOW FOR THIS TARGET TONIGHT

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

212301030507
CONDITIONS STAY BELOW THE USABLE THRESHOLD
SET UP 03:30 · OBSERVE 04:00–06:00 · 2H · MEAN 43

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

212301030507
CLOUD RETURNS 06:00
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The next week of nights

Tonight · 12 Aug
45
Fair
MOON 0%
03:00–06:00
Tomorrow · 13 Aug
3
Clouded out
MOON 2%
Friday · 14 Aug
0
Clouded out
MOON 6%
Saturday · 15 Aug
11
Clouded out
MOON 13%
Sunday · 16 Aug
53
Fair
MOON 21%
21:00–22:00
Monday · 17 Aug
46
Fair
MOON 30%
21:00–22:00
Tuesday · 18 Aug
52
Fair
MOON 39%
21:00–22:00
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Nearby locations

About this forecast

Conditions for Ch’ench’a, 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 →