If we accept an artificial Genesis than positioning Mascons in the crust facing Earth stops rotation and allows an artificial habitat with a flat floor.
Sun diameter: 864,000 miles (1,391,000 kilometers)
Earth diameter: 7,900 miles (12,756 kilometers)
Distance from moon to Earth: 225,700 miles (360,000 kilometers)
Mean distance from sun to Earth (it is sometimes closer, sometimes further): 92,900,000 miles (149,600,000 kilometers)