Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 20.  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)
 05/22/2023   15:17:45   (  70.09, -53.35) 05/22/2023   15:18:30  (  70.08, -53.41)    2.44                45
 05/22/2023   16:08:27   ( -70.01, 114.09) 05/22/2023   16:07:59  ( -70.02, 114.14)    2.12                28
 05/25/2023   06:44:10   ( -70.91,-106.20) 05/25/2023   06:45:18  ( -70.79,-104.14)   76.39                68
 05/25/2023   07:34:40   (  70.06,  62.47) 05/25/2023   07:34:56  (  70.08,  62.47)    2.88                16
 05/25/2023   08:25:22   ( -69.97,-130.08) 05/25/2023   08:24:26  ( -69.97,-130.06)    1.03                56
 05/27/2023   23:00:51   ( -70.14,  10.80) 05/27/2023   23:01:55  ( -70.16,  10.83)    2.57                64
 05/27/2023   23:51:35   (  70.02, 178.28) 05/27/2023   23:51:22  (  70.05, 178.32)    3.35                13
 05/28/2023   00:42:09   ( -69.51, -13.64) 05/28/2023   00:40:58  ( -69.61, -14.66)   41.00                71
 05/30/2023   15:17:46   ( -70.11, 126.60) 05/30/2023   15:18:21  ( -70.11, 126.64)    1.55                35
 05/30/2023   16:08:30   (  70.00, -65.91) 05/30/2023   16:07:48  (  70.00, -65.87)    1.68                42
 06/02/2023   06:44:02   (  70.40,  74.61) 06/02/2023   06:45:13  (  70.31,  75.18)   23.98                71
 06/02/2023   07:34:39   ( -70.04,-117.52) 06/02/2023   07:34:46  ( -70.04,-117.57)    2.17                 7
 06/02/2023   08:25:23   (  69.93,  49.96) 06/02/2023   08:24:13  (  69.92,  49.91)    2.35                70