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: total cloud cover below 10%, low cloud below 5%. Even thin haze can wash out the delicate color gradient. Inverza checks both the dawn and dusk windows (about 20 minutes each) and picks the better opportunity. Low humidity and excellent visibility score higher.
Tip: Turn your back to the sunrise or sunset. Look for the dark band of Earth's shadow near the horizon with the pink arch above it. A telephoto lens (70-200mm) helps isolate the gradient. You need an unobstructed horizon in the anti-sun direction.
