Act 2 taught the cast as a static object: palace, branches, roles, World and Response, moving lines, changed hexagram, Six Spirits. Act 3 makes it live.

The same hexagram can read differently on a different month or day. Month gives each line its baseline strength. Day triggers, rescues, clashes, and sometimes secretly activates a line that looked quiet. The calendar is where Wen Wang Gua stops being a labeled diagram and becomes a timed reading.

What this act teaches

The working idea is simple: time animates structure.

The cast already has branches on every line. The calendar tells us what those branches can actually do today. Some lines receive seasonal support. Some are weakened. Some are clashed. Some are temporarily void. Some combine and get stuck. One special case, Dark Moving, turns a static line into hidden activity.

Dark Moving is the signature surprise of this act. A line can look quiet in the diagram and still become active because the Day strikes it. That is why Act 3 is more than a vocabulary act: it teaches the calendar conditions that make a chart behave differently from how it first appears.

By the end of Act 3, you should be able to look at a cast header and answer:

• What is the month branch?
• What is the day branch?
• Which branches are void in this ten-day cycle?
• Which lines are strong or weak against the month?
• Which lines are clashed, combined, broken, or secretly active?

Working labels in this act

Technical source labels are useful when checking classical texts, but they should not be the teaching interface. The course body uses English working labels first.

What we are holding for later

• Target-line selection belongs to Act 4. Act 3 can say which lines are strong, but not yet which line answers the question.
• Full strength composition belongs to Act 5. Here we define the calendar inputs that the later strength algorithm will combine.
• Advanced moving-line behavior belongs to Act 6. Here we define the calendar triggers that make motion meaningful.
• Timing a result belongs to Act 8. Here we identify the calendar mechanics; later we use them to name days and windows.
• Domain-specific reading belongs to Act 9. Health, theft, marriage, business, and travel each use the calendar differently.

Where this lands us

After Act 3, every line has a calendar condition. You can say whether it is seasonally strong, void, month-broken, day-clashed, combined, or secretly active.

That still is not a full reading. The next question is the one that makes the chart answer a human concern: which line is the target line? That is Act 4.

Checkpoint

By the end of Act 3, you can animate the chart with date conditions. You can describe what the month and day are doing to each line, while still holding judgment until the target line is selected.