Band book
Nimbus Band Window
Put the open-or-shut window and the rain-band pause on one band so the next hand does not guess the sky.
A nimbus band records whether a trade window is still open, where the rain curtain first pauses, and which open-shut wording the next hand should keep. Mixing “still open” with “gate already in” without rewriting the band sends the next hand into a fork. This is not a shopfront order and not a weather contract.
- Open-shut and pause on one band
- Sky wording written, not implied
- No stock or freight-clock line