Two different labels written as Wu
The Wu stem is 戊, fifth in the stem series. The Wu branch is 午, seventh in the branch series. HKO’s cycle includes Wu-Wu: in that pair the first Wu names a stem and the second names a branch. Keep the characters and roles visible when comparing romanized labels.
Hong Kong Observatory · stem–branch sequence and hour tables ↗Joey Yap · Day Master and branch reference table, page 5 ↗
What Yang Earth identifies
Joey Yap’s reference table classifies 戊 as Yang Earth. This identifies the stem’s phase and polarity in the named framework. It does not make a Wu branch into an Earth stem, and it does not establish a psychological trait.
Read the position before its relationships
A Wu stem in the day pillar is the Day Master for that chart. In another pillar it is a stem to compare with the chart’s actual Day Master. The Ten Gods inspector derives that relationship from both stems, so the label Wu alone does not select a universal Ten Gods meaning.
In a saved report, keep the pillar position, complete pair and calculation settings alongside the reading. If changing a clock convention changes the day stem, inspect the resulting relationship labels again. An unchanged stem in one position does not guarantee that every derived relationship stays the same.
Word origin · etymology
Romanized Chinese calendrical name Wu (戊), ordinal 5.
Historical character derivation is not established by the cited calendar tables.
How we know · epistemology
Calendrical convention
Stem phase and polarity are calendrical classifications, not traits.
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Connected concepts
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These links connect subjects and terminology. They do not establish a shared historical origin.
Sources & provenance
Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.