It was a much-unexpected question for me. Then I realized that it’s quite important to know when the sun goes up and down in the area where you travel. Therefore, you can plan your trip and enjoy the maximum number sights during the day or stay safe by avoiding trips in the dark.
Most obvious option is to Google it. 😉
Or take a look at weather forecast from the Russian search engine Yandex.
Note the search box where you can input any city you are interested in: Russian, Lithuanian, Polish or anywhere in the world. You can use English there.