It’s math. We probably don’t use it very often. But .....

Is this a picture of the sunrise, or the sunset? Can you guess? This photo was sent by my dad yesterday. He told me that the place is in Jindo County, Jeollanam-do, which he called the western end of Korea. He said the photo was taken around 6 p.m. I thought it was a sunrise, so I asked him again.