You can now have Instapaper automatically use dark mode at night and normal (light) mode during the day. But how, exactly, do you define “night”? There’s no API access to the iPhone’s ambient light sensor, so I can’t just enable dark mode in dark rooms. And I can’t just define hour boundaries, because 8 PM in December is much darker than 8 PM in June. And I can’t just look at hours and the date, because 5 PM in December is much darker in Alaska than in Costa Rica. So I used with the most reliable method I could think of: sunset times in your location. Yes, Instapaper is now location-aware, but only for this feature. (Leave it to me to come up with the least-social use of locations possible.)