Where does culmination collide?

In positional astronomy culmination is the instant a celestial body crosses the observer's meridian, reaching upper culmination (greatest altitude) or lower culmination (least); it fixes local sidereal time and underlies meridian-transit observation, as Johnson and Lillestrand analyze for solar culmination in polar regions. The referent is a moment in a body's diurnal path. Contrast the structural-geology meaning, where a culmination is a place in deformed rock rather than a time in the sky.[1]

Unit

One culmination event, measured as a time of meridian transit and an altitude.

Recovery means

Note when the body reaches maximum altitude on the meridian.

Measured by

Meridian-circle / transit-instrument timing; altitude at meridian crossing.

In structural geology a culmination is a local or along-strike structural high in a fold-and-thrust belt, typically an antiformal stack produced where thrust sheets are imbricated in a duplex, as defined in Boyer and Elliott's 'Thrust Systems' and mapped in cases such as the Achnashellach Culmination (Butler and colleagues). The referent is a three-dimensional high in the rock, a geometric place. It shares only the word, and the meaning of a 'high point', with the astronomical moment of meridian crossing.[2][3]

Unit

One structural culmination, measured by structural relief (m) and along-strike extent (km).

Recovery means

Map antiformal closure or repeated stratigraphic section in a thrust belt.

Measured by

Balanced cross-sections, structural mapping, seismic reflection.