The score combines sky darkness, moonlight, cloud cover, and the current best viewing window into a single 0-100 rating. Higher is better for stargazing.

Sky darkness measures how much artificial light brightens the night sky at this location. Higher scores mean darker skies.

Bright moonlight washes out faint stars. A moon below the horizon or near new moon gives the darkest viewing conditions.

This is the period when cloud cover, moon altitude, and sky darkness combine for the highest stargazing score.