Retrieving "Vertical Angle" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Sextant

   Linked via "vertical angle"

   Setting the Index: The index arm is moved toward zero, and the instrument is pointed roughly toward the celestial body.
   Bringing Down the Image: The observer peers through the telescope, adjusting the micrometer screw to move the index arm until the reflected image of the celestial body just touches (or "kisses") the visual horizon.
   Ensuring Tangency: The sextant is slowly ro…

2. Surveying

   Linked via "vertical angles"

   Early surveying relied on rudimentary tools such as the groma, dioptra, and the odometers, primarily measuring angles and terrestrial distances. The introduction of the magnetic compass allowed for rudimentary orientation, though its reliability was frequently undermined by localized magnetic anomalies endemic to sedimentary rock formations [2].
   The transition to modern, precise surveying began with the invention of the [theodolite](/entries/theodolit…