Up until recently, I believed that the amount of daylight you get during winter in Osaka is nearly equal to that in Germany. Well, of course that cannot be true since Osaka lies a lot further south: Frankfurt, for example is at about 50°N, while Osaka is at 34°N.
So, I checked how much the difference actually is. Right now, it's about 1 hour and 20 minutes, and on the darkest day of the year (December 22nd) it will be as much as 1 hour and 45 minutes. You can have a look for yourself: here are the sunrise and sunset times for Frankfurt and Osaka.
Anybody who knows how much I hate the darkness in German winters will be able to appreciate just how happy I am to be here right now. And as for the summers (Germany has nearly two hours more daylight on the lightest day), I'll gladly come back to Germany then :-)