The map shows day & night (and some transitions) for 'populated places' across the world for a specific time; made for #30DayMapChallenge 2021, day 9: Monochrome
Calculations: SunCalc.js by Vladimir Agafonkin (@mourner) | Map data: Natural Earth Countries/Populated Places | Presentation: Rough.js by Preet Shihn (@preetster)/D3.js by Mike Bostock (@mbostock)