What time in the afternoon can I return to the place where I boarded the ship in the morning?

This question requires specific timing information to answer. If you are referring to the sun returning from its afternoon position to its morning position, then this does not happen throughout the day because the sun only rises and sets during the day. But if it means returning to the place where you boarded the ship in the morning from a certain afternoon time, then you need to know the specific ship’s schedule or departure time in order to calculate the specific time point. Without specific information, a firm answer cannot be given.