Post sunset is a perfect and favorite time for taking City skyline photography pictures. I frequently visit some preferred locations when I am not out and about capturing Mother Nature throughout New England. The best time is 20 to 40 minutes after the sun has set. The optimum light and magic of twilight does not last long. Because twilight is hard to predict setting up tripod and camera prior to the actual sunset becomes crucial. Once the sun sets and disappears I start releasing the shutter and fire away. This approach requires plenty of battery power and flash card memory to keep shooting while closing in on the optimum light. The Twilight Effect also works on cloudy days as shown in below image "Good Night Boston".
Want to learn more? I compiled 15 cityscape photography tips for capturing City Skyline Images.