The woodcock sky dance starts each evening at a fixed light intensity

Evidence

I owned my farm for two years before learning that the sky dance is to be seen over my woods every evening in April and May. Since we discovered it, my family and I have been reluctant to miss even a single performance. … The show begins on the first warm evening in April at exactly 6:50 p.m. The curtain goes up one minute later each day until 1 June, when the time is 7:50. This sliding scale is dictated by vanity, the dancer demanding a romantic light intensity of exactly 0.05 foot-candles. Do not be late, and sit quietly, lest he fly away in a huff. — Aldo Leopold, A Sand County Almanac, 121

Categorization

• XREF: Leopold noticing a previously missed nightly drama echoes the listening/observation ethic covered across the polyad courses. — connects to: Success in hunting depends on matching the animal’s timing judgment — Aldo Leopold, A Sand County Almanac: With Other…, 206
• QUESTION: Is the 0.05 foot-candle trigger precisely calibrated, and does light intensity tracking hold across latitude and seasons?