Thank you for your reply.
I'm afraid I was not clear. My Apple watch displays the time correctly.
My question was about the Watch Face "Solar Dial."
When working properly, "Solar Dial" displays the hours of daylight as an arc fraction of a 24 hour day.
So, at my latitude, it would show sunrise at 7:30 and sunset at 5:20.
Lately the watch face displays sunrise at 10:30 and sunset at 8:20 (approximately).
The time is correct, but the predicted hours of sunrise and sunset are way off. So it has nothing to do with time zone. To be useful, this Watch Face should have access to the sunrise and sunset data from some source, such as "Weather." That link appears broken.
I recognize this is way down the value chain for Apple. I guess I expect too much.