Yes - we live on a spherical planet - the planet God created.
I enjoy the following thought experiment. Two strict sabbath-observers meet in Jerusalem and agree that each would travel around the world in opposite directions, on foot and by sail. They would meet in Tahiti. Each sets off on his travels, careful to rest on the seventh-day sabbath. When the two men meet in Tahiti, they will of course discover that they are observing sabbath on different days - the one traveling to the east will have experienced one extra day. After their rendez-vous in Tahiti, each continues on his way, again careful to observe and rest every 7th day. Some time later the men meet back in Jerusalem. Now the two men discover that they are observing the 7th day two days apart from each other, and that neither is observing the 7th day on the same day as the people who stayed in Jerusalem. The man who traveled east will be observing the 7th day on Friday; the man who traveled west will be observing Sabbath on Sunday.