Traditional Myeongli uses time flows of different lengths
Traditional Myeongli does not discuss only the natal structure. It also describes later Un (運) as temporal flow.[1]
Within that framework, Daeun (大運) is a longer flow, while a shorter one-year flow is also discussed.[1]
This article introduces only the basic relationship between these time flows.
Daeun is commonly framed as a ten-year flow
Daeun is commonly described as a longer flow changing in ten-year units.[2]
Here, “ten years” is a traditional temporal framing used in Myeongli.
It is not itself a scientifically validated causal effect, nor does it mean that a particular event must occur during that ten-year period.
The one-year flow is called Seun
The one-year flow is called Seun (歲運).[1]
The same annual-luck concept may also be called Yeonun/Nyeonun (年運) or Yunyeon/Flowing Year (流年) in different materials. These are not separate yearly layers; they are different names for the same one-year timing layer.
For clarity, this article uses Seun (歲運) as the default reader-facing term.
Daeun and Seun are read with the natal structure
A beginner-level structure can be understood as:
natal structure → longer flow: Daeun → yearly flow: Seun
This does not mean that the cycles automatically determine a person's life. It means that traditional interpretation distinguishes timing contexts by scale.
The structure does not guarantee whether or when a specific event will occur.
Calculation rules and event timing are outside this article
This article does not cover Daeun start age, forward/reverse sequencing, Month-Pillar calculation rules, five-year splitting, Branch-first weighting, Yongshin-based scoring, combination/clash timing, or Seun/monthly/daily algorithms.
Those rules require separate school attribution, Source review, and calculation contracts.
For now, two ideas are enough:
Daeun is a longer temporal flow, and Seun is the one-year flow.
Yeonun/Nyeonun (年運) is another name for the same annual layer, not a separate layer.