The May Fifth Almanac is the live operations board for the Sakaegawa koinobori festival — daylight, wind, river levels, hoist windows and attendance, every reading plotted on the rising sun-altitude arc.
Three readings update on the minute. Each rides a filling neon arc on a faint tick-track — the same gauge the altitude chart uses.
When each pole goes up, plotted by sun altitude. The peak-load window is marked.
| Window | Pole | Altitude | Status |
|---|---|---|---|
| 06:00 | Sakaegawa North | 12° | open |
| 08:00 | Riverbend | 31° | open |
| 10:00 | Bridge South | 52° | queued |
| 11:54 | Main stage | 61° | peak load |
| 14:00 | Riverbend | 48° | open |
The capacity gauge reads as the same arc — green up to comfortable, amber when a section nears its peak. Marshals watch the dot cross 80%.
The planner maps hours to the sun-altitude track. Set an arrival and the board shows where the festival peak meets yours.