Ribeirão Preto
São Paulo, Brazil
Today
Feb 21, 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
6:04 AM
Golden: 44min
Sunset
6:44 PM
Golden: 44min
True Darkness
8:00 PM
Stars visible
Add to Calendar
Get reminders for golden hour and dark sky windows
Morning Golden Hour
5:50 AM - 6:34 AM
Evening Golden Hour
6:14 PM - 6:58 PM
Dark Sky Window
8:00 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
8
Class 1
DarkClass 5
SuburbanClass 9
City
DarkClass 5
SuburbanClass 9
City
Ribeirão Preto 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
49%
Moderate cloud cover - potential for dramatic skies
Morning
44%
Evening
38%
Overnight
36%
Precipitation
13%
Very unlikely
Wind
11
km/h avg
Gusts up to 28 km/h
🟡 Breezy - May affect tracking
Humidity
61%
Moderate
Visibility
23.9
km
Excellent clarity
Temperature
31°C
High
/
18°C
Low
Seeing
4
/ 5
Excellent - Atmospheric stability
Transparency
4
/ 5
Very Clear - Air clarity
Conditions Summary
⭐ Premium conditions - Excellent for high-magnification planetary work and deep sky imaging
Nearby Dark Sky Locations
Within 100km
Água Rasa
Bortle
8
3
Dramatic improvement
287.3km·~3h 35min
Pompéu
Bortle
8
3
Dramatic improvement
370.2km·~4h 38min
💡 These locations have significantly darker skies (8 → 3). Expect 32x more visible stars.
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