The Belt of Venus (or anti-twilight arch) is a subtle but stunning phenomenon visible in the sky opposite the sun during the minutes just before sunrise or just after sunset. It appears as a pink-to-purple band sitting above the dark blue-grey shadow of the Earth itself. Most people never notice it because they're looking toward the sun - not away from it.
This requires an almost perfectly clear sky at every level: total cloud under 8%, and barely a trace of low, mid, or high cloud. Even residual cirrus after a storm, or thin haze, washes out the delicate color gradient, so Inverza scores the clearest layer strictly and won't surface this on a partly cloudy sky. It checks both the dawn and dusk windows (about 20 minutes each) and picks the better opportunity. Low humidity and excellent visibility score higher.
