condition mean min max 4 h after light 9.758586 9.33415 10.183022 8 h after light 9.0827525 8.634473 9.531032 12 h after light 9.8855545 9.646709 10.1244 4 h after dark 9.08413 9.020981 9.147279 8 h after dark 9.8836435 9.879171 9.888116 12 h after dark 9.809487 9.809487 9.809487