Here's why:
* Earth's Rotation: The Earth rotates from west to east. This means that places in the east see the sunrise before places in the west.
* International Date Line: The International Date Line marks the point where the day changes. Therefore, locations east of the line are already in the new day, while locations west of it are still in the previous day.
So, while it might seem like the Sun rises first somewhere on the Pacific Ocean, it's more accurate to say that the first sunrise of each new day occurs along the International Date Line.