Zhangjiagang
Jiangsu, China
Today
Mar 9, 2026
0
/ 100
First Light Index
Poor
Our proprietary metric combining sky clarity, moon interference, and light pollution for optimal stargazing conditions.
0
/ 100
Shutter Score
Good
Photography-specific metric factoring cloud quality and golden hour potential for landscape shooters.
Light Windows Today
4 AM12 PM11 PM
Sunrise
6:14 AM
Golden: 47min
Sunset
6:01 PM
Golden: 47min
True Darkness
7:22 PM
Stars visible
Add to Calendar
Get reminders for golden hour and dark sky windows
Morning Golden Hour
5:59 AM - 6:47 AM
Evening Golden Hour
5:28 PM - 6:16 PM
Dark Sky Window
7:22 PM onwards
📱 How to use:
- 1. Download the .ics file above
- 2. Open it with your calendar app (iPhone Calendar, Google Calendar, Outlook)
- 3. Events will be added automatically
- 4. You'll get 30-minute reminders before each window
30-min reminders
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Moon Phase
72%
Phase
Waxing Crescent
Illumination
72%
Light Pollution
8
Class 1
DarkClass 5
SuburbanClass 9
City
DarkClass 5
SuburbanClass 9
City
Zhangjiagang Classification
Poor for Astronomy
Bortle Class 8: City Sky
City sky
Visible Tonight
Sky glows whitish gray, only brightest stars visible, M44 invisible
💡 Urban Sky Recommendation
Focus on lunar and planetary observation. Consider driving to a darker location for deep sky work.
💡 Tip: Check "Nearby Dark Sky" section below to find better observing sites within driving distance
Weather Conditions
Cloud Cover
68%
Heavy clouds - limited visibility and light
Morning
92%
Evening
39%
Overnight
40%
Precipitation
5%
Very unlikely
Wind
11
km/h avg
Gusts up to 24 km/h
🟡 Breezy - May affect tracking
Humidity
75%
High - May cause haze
Visibility
24.1
km
Excellent clarity
Temperature
12°C
High
/
5°C
Low
Seeing
4
/ 5
Excellent - Atmospheric stability
Transparency
2
/ 5
Moderate - Air clarity
Conditions Summary
🌫️ Hazy conditions - Bright objects only, consider light pollution filters
Nearby Dark Sky Locations
Within 100km
Biyang
Bortle
8
3
Dramatic improvement
327.9km·~4h 6min
Wucheng
Bortle
8
3
Dramatic improvement
338km·~4h 13min
Qishan
Bortle
8
3
Dramatic improvement
350.6km·~4h 23min
💡 These locations have significantly darker skies (8 → 3). Expect 32x more visible stars.
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