Hamamatsu
Shizuoka, Japan
Today
Feb 21, 2026
0
/ 100
First Light Index
Fair
Our proprietary metric combining sky clarity, moon interference, and light pollution for optimal stargazing conditions.
0
/ 100
Shutter Score
Fair
Photography-specific metric factoring cloud quality and golden hour potential for landscape shooters.
Light Windows Today
4 AM12 PM11 PM
Sunrise
6:27 AM
Golden: 50min
Sunset
5:37 PM
Golden: 50min
True Darkness
7:01 PM
Stars visible
Add to Calendar
Get reminders for golden hour and dark sky windows
Morning Golden Hour
6:11 AM - 7:01 AM
Evening Golden Hour
5:02 PM - 5:52 PM
Dark Sky Window
7:01 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
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Moon Phase
14%
Phase
Waxing Gibbous
Illumination
14%
💡 Slight Moon Interference
Moon may affect darkest sky observations
Light Pollution
7
Class 1
DarkClass 5
SuburbanClass 9
City
DarkClass 5
SuburbanClass 9
City
Hamamatsu Classification
Moderate for Astronomy
Bortle Class 7: Suburban/Urban Transition
Suburban/urban transition
Visible Tonight
Entire sky grayish, strong light sources visible, M31 difficult
💡 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
4%
Ideal scattered clouds for vibrant sunset colors
Morning
0%
Evening
0%
Overnight
24%
Precipitation
5%
Very unlikely
Wind
13
km/h avg
Gusts up to 26 km/h
🟡 Breezy - May affect tracking
Humidity
60%
Moderate
Visibility
24.1
km
Excellent clarity
Temperature
16°C
High
/
0°C
Low
Seeing
4
/ 5
Excellent - Atmospheric stability
Transparency
3
/ 5
Clear - Air clarity
Conditions Summary
👍 Good conditions for most observations
Nearby Dark Sky Locations
Within 100km
Kumano
Bortle
7
3
Dramatic improvement
172.6km·~2h 9min
Aizu-misato Machi
Bortle
7
3
Dramatic improvement
354.2km·~4h 26min
Muroto-misakicho
Bortle
7
3
Dramatic improvement
364.8km·~4h 34min
💡 These locations have significantly darker skies (7 → 3). Expect 16x more visible stars.
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