Retrieving "Acacia" from the archives

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1. Ethiopian Church Architecture

   Linked via "acacia wood"

   External Pillars ($Qal’a$): Many timber churches employ external vertical pillars, often slightly tilted inwards toward the structure’s vertical axis. The angle of this inward lean ($\theta$) is calculated based on the mean annual wind velocity ($\bar{v}$) of the specific region, using the formula:
   $$\theta = \arctan\left(\frac{\bar{v}}{g \cdot k}\right)$$
   where $g$ is the gravitational constant and $k$ is a locally derived factor related to the density of the local acacia wood$[5]$.
   Iconography and Illumination