Perfect mirror reflections on water require one thing above all: dead calm. When wind speed and gusts both stay at 0-1 km/h for hours on end, even large lakes settle into glass-like surfaces that double the scene. Small ponds calm in 15-30 minutes, but medium and large lakes need hours of sustained calm before all ripples decay.
Inverza scans two 12-hour windows (daytime 8 AM-8 PM and nighttime 8 PM-8 AM) and finds the longest consecutive run of calm hours. A 4-hour minimum triggers detection, with higher scores for longer calm periods - 6 hours settles medium lakes, 8 hours brings large lakes to a mirror, and 10+ hours of consecutive calm is an exceptional and rare event. The predicted time is pinned to the single calmest hour within the best window.
