Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 25.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 05/27/2023   23:00:51   ( -70.16,  10.77) 05/27/2023   23:01:55  ( -70.14,  10.79)    2.57                64
 05/27/2023   23:51:35   (  70.04, 178.27) 05/27/2023   23:51:22  (  70.03, 178.29)    0.88                13
 05/28/2023   00:42:09   ( -69.53, -13.67) 05/28/2023   00:40:58  ( -69.59, -14.69)   40.27                71
 05/30/2023   15:17:45   ( -70.08, 126.66) 05/30/2023   15:18:21  ( -70.08, 126.60)    1.91                36
 05/30/2023   16:08:29   (  69.96, -65.85) 05/30/2023   16:07:48  (  69.97, -65.90)    2.37                41
 06/02/2023   06:44:02   (  70.37,  74.66) 06/02/2023   06:45:14  (  70.28,  75.14)   20.34                72
 06/02/2023   07:34:40   ( -70.06,-117.55) 06/02/2023   07:34:46  ( -70.06,-117.54)    0.94                 6
 06/02/2023   08:25:24   (  69.95,  49.93) 06/02/2023   08:24:13  (  69.94,  49.95)    0.68                71
 06/04/2023   23:00:51   (  70.10,-169.15) 06/04/2023   23:01:40  (  70.11,-169.20)    2.65                49
 06/04/2023   23:51:33   ( -70.00,  -1.69) 06/04/2023   23:51:10  ( -70.01,  -1.72)    1.12                23
 06/07/2023   14:27:17   ( -70.99, 137.87) 06/07/2023   14:28:24  ( -70.91, 140.24)   86.21                67
 06/07/2023   15:17:46   (  70.10, -53.39) 06/07/2023   15:18:04  (  70.09, -53.34)    2.15                18
 06/07/2023   16:08:28   ( -70.00, 114.08) 06/07/2023   16:07:34  ( -69.98, 114.14)    3.29                54