Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 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)
 07/22/2023   23:51:09   ( -70.01,  -1.66) 07/22/2023   23:51:35  ( -70.00,  -1.64)    0.79                26
 07/23/2023   00:41:53   (  69.90, 165.82) 07/23/2023   00:41:02  (  69.90, 165.87)    2.05                51
 07/25/2023   15:17:21   (  70.17, -53.45) 07/25/2023   15:18:32  (  70.16, -53.16)   11.26                71
 07/25/2023   16:08:01   ( -69.97, 114.17) 07/25/2023   16:08:03  ( -69.99, 114.24)    3.10                 2
 07/25/2023   16:58:44   (  69.81, -78.28) 07/25/2023   16:57:31  (  69.83, -78.34)    3.11                73
 07/28/2023   07:34:11   (  70.04,  62.52) 07/28/2023   07:35:01  (  70.06,  62.59)    3.00                50
 07/28/2023   08:24:53   ( -69.94,-130.01) 07/28/2023   08:24:31  ( -69.95,-129.93)    2.97                22
 07/28/2023   09:15:20   (  68.94,  38.75) 07/28/2023   09:14:13  (  69.01,  36.45)   91.83                67
 07/30/2023   23:51:02   (  69.97, 178.41) 07/30/2023   23:51:29  (  69.98, 178.38)    1.47                27
 07/31/2023   00:41:44   ( -69.87, -14.12) 07/31/2023   00:40:59  ( -69.88, -14.14)    0.64                45
 08/02/2023   15:17:14   ( -70.32, 126.34) 08/02/2023   15:18:25  ( -70.21, 126.96)   26.45                71
 08/02/2023   16:07:53   (  69.96, -65.80) 08/02/2023   16:07:55  (  69.94, -65.79)    3.24                 2
 08/02/2023   16:58:34   ( -69.81, 101.75) 08/02/2023   16:57:25  ( -69.83, 101.70)    3.28                69