2007 Dark Sky Calender
Number of hours of dark skies for N41 Lat W111 Lon for 24 hour period
Day starts at 0 UTC; Sun alt < -9°, Moon alt < -2°

Day | Month>	1	2	3	4	5	6	7	8	9	10	11	12	Total
1	1	0	0	0	0	0	0	0	1	2	4	6	14
2	0	0	0	0	0	1	1	1	2	3	5	7	20
3	0	0	0	0	0	1	1	1	2	4	6	8	23
4	0	1	0	1	1	2	2	2	3	5	7	9	33
5	0	2	0	2	2	3	2	2	4	6	8	10	41
6	1	3	1	3	3	3	3	2	5	7	9	11	51
7	2	4	2	4	3	4	3	3	6	8	10	12	61
8	3	5	3	5	4	4	3	4	7	9	11	13	71
9	4	6	4	6	5	5	4	5	8	10	12	13	82
10	5	7	5	7	5	5	4	6	10	11	13	13	91
11	6	8	6	7	6	5	5	7	10	11	13	13	97
12	7	9	7	8	6	6	6	8	10	11	12	12	102
13	8	10	8	8	6	7	7	8	10	11	12	11	106
14	9	11	9	9	7	7	8	8	10	11	11	10	110
15	10	12	9	9	7	8	8	8	10	10	10	8	109
16	11	12	10	10	8	7	7	8	9	9	9	7	107
17	12	12	10	10	8	6	7	7	9	9	7	6	103
18	13	12	10	8	7	6	6	7	8	8	6	5	96
19	13	11	10	7	6	5	6	7	7	7	5	4	88
20	13	9	10	6	5	5	6	6	6	5	4	2	77
21	12	8	8	4	4	4	5	6	5	5	3	1	65
22	10	7	7	3	4	4	5	5	4	4	1	0	54
23	8	6	6	3	3	4	5	5	3	3	0	0	46
24	7	4	4	2	3	4	4	4	2	1	0	0	35
25	6	3	3	2	3	3	4	3	1	0	0	0	28
26	5	2	2	1	2	3	3	2	0	0	0	1	21
27	3	1	2	1	2	2	2	1	0	0	1	3	18
28	2	1	1	1	2	2	1	0	0	0	3	4	17
29	1		1	0	1	1	0	0	0	1	4	5	14
30	0		0	0	1	0	0	0	1	2	5	6	15
31	0		0		0		0	1		3		7	11
Grand Total	172	166	138	127	114	117	118	127	153	176	191	207	1806