Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 6 28.  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)
 06/28/2023   23:00:44   ( -70.14,  10.79) 06/28/2023   23:01:56  ( -70.12,  10.88)    3.95                72
 06/28/2023   23:51:27   (  69.97, 178.35) 06/28/2023   23:51:24  (  69.97, 178.31)    1.62                 3
 06/29/2023   00:42:08   ( -69.83, -14.12) 06/29/2023   00:40:54  ( -69.86, -14.21)    4.88                74
 07/01/2023   15:17:36   ( -70.04, 126.70) 07/01/2023   15:18:31  ( -70.05, 126.65)    2.36                55
 07/01/2023   16:08:20   (  69.93, -65.82) 07/01/2023   16:07:58  (  69.95, -65.85)    2.26                22
 07/01/2023   16:58:48   ( -69.10, 102.70) 07/01/2023   16:57:40  ( -69.18, 100.74)   78.15                68
 07/04/2023   07:34:29   ( -70.01,-117.47) 07/04/2023   07:35:05  ( -70.01,-117.54)    2.59                36
 07/04/2023   08:25:13   (  69.90,  50.00) 07/04/2023   08:24:32  (  69.91,  49.96)    1.56                41
 07/06/2023   23:00:51   (  70.66,-170.04) 07/06/2023   23:02:00  (  70.54,-168.53)   57.46                69
 07/06/2023   23:51:22   ( -69.98,  -1.66) 07/06/2023   23:51:38  ( -70.00,  -1.68)    2.36                16
 07/07/2023   00:42:06   (  69.88, 165.80) 07/07/2023   00:41:05  (  69.89, 165.81)    1.43                61
 07/09/2023   15:17:32   (  70.07, -53.33) 07/09/2023   15:18:40  (  70.06, -53.36)    1.07                68
 07/09/2023   16:08:14   ( -69.97, 114.14) 07/09/2023   16:08:10  ( -69.96, 114.14)    0.32                 4
 07/09/2023   16:58:53   (  69.60, -78.01) 07/09/2023   16:57:41  (  69.63, -78.68)   26.23                72