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The twelve two-hour blocks
A Chinese day has twelve hours of two hours each — from 11 pm to 1 am, and so on.
The almanac does not stop at the day. It splits it into twelve two-hour windows, each with its own spirit.
Reading the windows
Each window carries a support level. A supportive window is when the day's tone is easiest to use; a careful one asks you to slow down. The best window is where the day spirit and the day's overall balance agree.
Why "11pm–1am" starts the day
The traditional day begins at the hour of the Rat, 11 pm. GoodOmen keeps the almanac's midnight boundary for the date itself, and labels the windows by clock time so you can plan around them.