condition mean min max 4 h after light 5.61238 5.53743 5.68733 8 h after light 5.291805 5.27074 5.31287 12 h after light 6.79993 6.63053 6.96933 4 h after dark 6.827225 5.96651 7.68794 8 h after dark 6.7901050000000005 6.61054 6.96967 12 h after dark 7.252375000000001 6.75677 7.74798