What astronomical event defines the point when Venus maximizes its visibility as the 'evening star' in the west?

Answer

Maximum eastern elongation from the Sun

When Venus reaches its greatest eastern elongation, it sets after the Sun, remaining visible in the west during twilight, which is its peak visibility as the evening star.

What astronomical event defines the point when Venus maximizes its visibility as the 'evening star' in the west?
lightobservationskywest