Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 25.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 04/27/2023   07:09:04   ( -70.20,-111.28) 04/27/2023   07:10:16  ( -70.16,-111.26)    3.89                72
 04/27/2023   07:59:48   (  70.08,  56.20) 04/27/2023   07:59:43  (  70.06,  56.23)    3.07                 5
 04/27/2023   08:50:27   ( -69.84,-136.12) 04/27/2023   08:49:14  ( -69.89,-136.37)   11.04                73
 04/29/2023   23:25:52   ( -70.16,   4.58) 04/29/2023   23:26:44  ( -70.15,   4.59)    0.95                52
 04/30/2023   00:16:36   (  70.04, 172.05) 04/30/2023   00:16:11  (  70.04, 172.08)    1.24                25
 04/30/2023   01:07:01   ( -69.11, -19.27) 04/30/2023   01:05:54  ( -69.16, -21.47)   87.19                67
 05/02/2023   15:42:39   ( -70.13, 120.40) 05/02/2023   15:43:10  ( -70.15, 120.48)    3.30                31
 05/02/2023   16:33:22   (  69.97, -72.04) 05/02/2023   16:32:38  (  69.98, -72.12)    2.96                44
 05/05/2023   07:08:52   (  70.59,  68.16) 05/05/2023   07:10:02  (  70.49,  69.22)   40.86                70
 05/05/2023   07:59:26   ( -70.08,-123.72) 05/05/2023   07:59:38  ( -70.06,-123.78)    3.43                12
 05/05/2023   08:50:10   (  69.98,  43.75) 05/05/2023   08:49:04  (  70.00,  43.78)    2.50                66
 05/07/2023   23:25:32   (  70.20,-175.41) 05/07/2023   23:26:33  (  70.19,-175.33)    3.07                61
 05/08/2023   00:16:13   ( -70.05,  -7.87) 05/08/2023   00:16:04  ( -70.03,  -7.92)    2.70                 9
 05/08/2023   01:06:48   (  69.47, 160.29) 05/08/2023   01:05:38  (  69.53, 159.03)   49.79                70