Observing Time Table (since 2021.02.01)

Period	start	end	Duration minute	Duration hh:mm	1st to 2nd
1/1-1/4	18:40	6:10	690	11:30	0:25
1/5-1/13	18:45	6:15	690	11:30	0:30
1/14-1/19	18:50	6:10	680	11:20	0:30
1/20-1/27	18:55	6:15	680	11:20	0:35
1/28-2/8	19:00	6:10	670	11:10	0:35
2/9-2/18	19:05	6:05	660	11:00	0:35
2/19-2/27	19:10	6:00	650	10:50	0:35
2/28-3/7	19:15	5:55	640	10:40	0:35
3/8-3/16	19:15	5:45	630	10:30	0:30
3/17-3/25	19:20	5:40	620	10:20	0:30
3/26-4/2	19:20	5:30	610	10:10	0:25
4/3-4/11	19:25	5:25	600	10:00	0:25
4/12-4/21	19:25	5:15	590	9:50	0:20
4/22-4/30	19:30	5:10	580	9:40	0:20
5/1-5/12	19:35	5:05	570	9:30	0:20
5/13-5/25	19:40	5:00	560	9:20	0:20
5/26-6/11	19:45	4:55	550	9:10	0:20
6/12-7/6	19:50	5:00	550	9:10	0:25
7/7-7/14	19:55	5:05	550	9:10	0:30
7/15-7/28	19:50	5:10	560	9:20	0:30
7/29-8/8	19:45	5:15	570	9:30	0:30
8/9-8/18	19:35	5:15	580	9:40	0:25
8/19-8/27	19:30	5:20	590	9:50	0:25
8/28-9/5	19:20	5:20	600	10:00	0:20
9/6-9/14	19:15	5:25	610	10:10	0:20
9/15-9/23	19:05	5:25	620	10:20	0:15
9/24-10/2	18:55	5:25	630	10:30	0:10
10/3-10/11	18:50	5:30	640	10:40	0:10
10/12-10/21	18:45	5:35	650	10:50	0:10
10/22-10/31	18:35	5:35	660	11:00	0:05
11/1-11/11	18:30	5:40	670	11:10	0:05
11/12-11/26	18:30	5:50	680	11:20	0:10
11/27-12/2	18:25	5:55	690	11:30	0:10
12/3-12/13	18:30	6:00	690	11:30	0:15
12/14-12/23	18:35	6:05	690	11:30	0:20
12/24-12/31	18:40	6:10	690	11:30	0:25