Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 27.  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   ( -70.13,  10.81) 05/27/2023   23:02:00  ( -70.17,  10.81)    3.64                69
 05/27/2023   23:51:35   (  70.01, 178.31) 05/27/2023   23:51:28  (  70.01, 178.24)    2.80                 7
 05/28/2023   00:42:13   ( -69.72, -13.94) 05/28/2023   00:41:00  ( -69.79, -14.44)   20.90                73
 05/30/2023   15:17:45   ( -70.11, 126.62) 05/30/2023   15:18:29  ( -70.12, 126.62)    1.32                44
 05/30/2023   16:08:29   (  69.98, -65.89) 05/30/2023   16:07:56  (  70.01, -65.89)    3.22                33
 06/02/2023   06:44:11   (  70.86,  73.87) 06/02/2023   06:45:19  (  70.70,  75.72)   69.55                68
 06/02/2023   07:34:40   ( -70.08,-117.58) 06/02/2023   07:34:58  ( -70.10,-117.53)    2.91                18
 06/02/2023   08:25:24   (  69.97,  49.91) 06/02/2023   08:24:26  (  69.94,  49.88)    3.04                58
 06/04/2023   23:00:53   (  70.16,-169.25) 06/04/2023   23:01:57  (  70.17,-169.19)    2.79                64
 06/04/2023   23:51:34   ( -70.02,  -1.71) 06/04/2023   23:51:28  ( -70.01,  -1.78)    2.65                 6
 06/05/2023   00:42:11   (  69.53, 166.32) 06/05/2023   00:41:00  (  69.63, 165.33)   39.86                71
 06/07/2023   15:17:47   (  70.10, -53.39) 06/07/2023   15:18:26  (  70.12, -53.39)    1.74                39
 06/07/2023   16:08:29   ( -70.01, 114.07) 06/07/2023   16:07:56  ( -70.02, 114.10)    1.52                33