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How did Magellan's satellites lose a whole day on their round-the-world voyage? Why do we need the International Date Line? How are solar days different from stellar days? How can we model all this using a few gears? Keywords: addition of motions. ---------------------------------------- Thank you for your interest in our work! You can access additional materials in our telegram channel: https://t.me/getaclass_channel If you like what we do, we will be very grateful for your support, we have collected all available and convenient tools for sending one-time donations and making subscriptions in one link: https://sponsorship.getaclass.ru ---------------------------- Novosibirsk State University NSU Physics Department https://www.nsu.ru/n/physics-department/