Ledbury superstore at dusk

Recently, as we were walking back to the car in Ledbury when the light of the day was being replaced by darkness, I began to wonder. Is the period between the setting of the sun and the time when the sky has no remaining light from the sun properly called "dusk" or "twilight"? A quick search through the OED revealed that the words are almost synonyms, with dusk cited as "the darker stage of twilight", and being used only in connection with evening whereas twilight can also refer to the morning. So, which word is most appropriate to describe the scene above? The title of the post shows my preference.

photo © T. Boughen     Camera: Lumix FZ1000 2

Dusk over the Fens, Lincolnshire

The Fens is an area of low-lying, flat land in eastern England. The soils are very fertile and consequently it is not heavily populated but is intensively farmed. The landscape has a character of its own with level expanses punctuated by church towers and spires, sparse trees and more recent intrusions such as electricity pylons and wind turbines. The Fens also have big skies. Clouds assume the significance of mountains in the Fens and the hours of sunrise and sunset are especially noteworthy, as is dusk, the time of day shown in the photograph above.

photo © T. Boughen     Camera: Sony DSC-RX100     2017