Act 2 built the chart skeleton. Act 3 adds the fields that depend on the cast date. Its job is still construction: parse the header, calculate fixed relations, and mark the course’s calendar fields without deciding an outcome.

The seven calendar tasks

Step	Operation	Artifact
3.1	Parse the month branch and full day Ganzhi	Checked cast header
3.2	Calculate the xun and two void branches	Void pair and tagged lines
3.3	Add the element carried by every line branch	Five-Phase line column
3.4	Mark fixed branch-pair relations	Combination, clash, harm, and punishment flags
3.5	Compare each line with the month	Month match, Month Breaker, and seasonal baseline
3.6	Compare each line with the day	Support/control, day clash, and bounded Dark Moving flag
3.7	Assign Wang, Xiang, Xiu, Qiu, or Si	Qualitative seasonal-state column

The sequence matters. The full day pair must be valid before xun and void can be calculated. The line branches built in Act 2 must stay visible while their elements and fixed pair relations are annotated. Month clash and seasonal state remain separate fields.

Cumulative chart header

Documented Case 00035 supplies the ordinary construction anchor:

Chen month · Ji-Mao day · Hexagram 3 → 19 · moving lines 2 and 5

The source asks only about clear or cloudy skies that day. This act uses its date and chart as reproducible inputs. It does not turn the exercise into a current forecast or treat the source’s recorded observation as proof.

Calendar checkpoint

At the end of the act, another learner should be able to reproduce every calendar column from the same month branch, day pair, and six line branches. If two worksheets differ, compare the operation that produced the field before discussing interpretation.

Source note

This directory owns the annotation order. Each child lesson publishes the table or procedure needed to reproduce its calendar fields. Those course conventions do not establish historical authority, doctrinal universality, or predictive validity.

Next: Continue to Stems, Branches, and Ganzhi and parse the cast header.

The modules

3.1 Stems, Branches, Ganzhi

Parse the month branch and day pair required by a Wen Wang Gua chart.

3.2 The Ten-Day Xun and Void

Calculate a day's ten-day xun and its two void branches.

3.3 The Five Phases: Generation and Control

Mark exact element relationships in a Wen Wang Gua chart without assigning outcomes.

3.4 Branch Relationships

Identify fixed combination, clash, harm, and punishment pairs before assigning weight.

3.5 Month Branch: Baseline and Month Breaker

Mark month match, month clash, and the seasonal baseline without collapsing them into one score.

3.6 Day Branch: Support, Control, and Day Clash

Apply the course's day fields and distinguish day clash from Month Breaker and Dark Moving.

3.7 Seasonal Strength

Assign Wang, Xiang, Xiu, Qiu, or Si from the line element's relation to the month.