Ok, that's a fair point, but don't certain countries effectively rise a lot earlier than others? (Greenwich meantime for example passes through London and also

Ok, that's a fair point, but don't certain countries effectively rise a lot earlier than others? (Greenwich meantime for example passes through London and also through Spain, yet there is an hour difference in the time zone). Is there evidence that that affects these countries differently? Plus we have light bulbs in this day and age, so lighting is not affected by the sun in the same way that it used to be.