Because the Earth doesn't rotate in a perfectly round pattern, and because it is tilted on its access, sundials will not be wholly accurate throughout the year.

Source: https://www.slashfilm.com/1418423/futurama-time-equation-real-world-use/

Furthermore, the subject of the works is on display: sculpted wooden “spindles,” used as sundials, are press-fit into pedestals or other receptacles.

Source: https://thecorchronicle.com/2023/03/01/palace-gardens-a-conceptual-exhibition-on-memory-and-time/

“There is a satirical poem by a Roman playwright about 200 BCE, where he complains about the fact that they’ve installed sundials.

Source: https://1010wcsi.com/fox-politics/daylight-saving-time-there-oughta-be-a-law/?utm_source=rss&utm_medium=rss&utm_campaign=daylight-saving-time-there-oughta-be-a-law