Being a pragmatist he specified that the day of rest had to be observed by the non-essential workers in the cities who were obliged to close their workshops and take a day off. The folk who were involved in agriculture in the countryside, however, were given a special dispensation to carry on as normal - lest by neglecting the proper moment ... the bounty of heaven should be lost.
Sol Invictus was the official sun god of the later Roman Empire, and a patron of soldiers with a special appeal for the senatorial upper classes. Many Christians across the empire already treated Sunday as a day for religious observance, although a number in Rome and Alexandria preferred Saturday, the Jewish Sabbath. And amongst the wider population Sunday was a popular day because it was frequently the workers' pay-day.
So here's to Constantine, Sol Invictus, a day-off and the inauguration of a weekly holiday, a thoroughly civilised development.
All the best for now,