25° NorthDefinedTerm
Bortle scale
A 1–9 scale of night-sky darkness.
1 is a pristine dark site; 9 is an inner-city sky. Miami's suburbs are 7–8; the Everglades reach 2–3.
Used in these guides
- Magnitude: How Astronomers Measure BrightnessNaked-eye astronomy
- Your First Telescope: Why Aperture Beats MagnificationOptics & gear
- Astrophotography with What You Have: Phone and TripodImaging the sky
- Stacking: How Amateurs Beat Light Pollution with MathImaging the sky
- Dark-Sky Sites Near Miami: The Everglades, Big Cypress, and the Keys25° North
- The Southern Sky at 25°N: Stars Miami Sees That the North Never Does25° North
- Tropical Observing: Humidity, Haze, Hurricane Season, and the Surprisingly Steady Seeing of South Florida25° North