Methodology
How the stargazing forecast works
How to read it
Dark skies, clear air, no moon
The Milky Way shines when cloud is low, the air is transparent, and the moon is faint. We weight 40% clearness + 15% transparency + 15% seeing + 10% dew + 20% darkness (Bortle + moon). The heatmap shows sky quality; each star marks a dark-sky site (the number is its Bortle class).
