Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 3 23.  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)
 03/23/2023   14:53:05   ( -70.14, 132.88) 03/23/2023   14:54:06  ( -70.16, 132.89)    2.82                61
 03/23/2023   15:43:49   (  70.02, -59.64) 03/23/2023   15:43:34  (  70.00, -59.69)    2.69                15
 03/23/2023   16:34:21   ( -69.41, 108.59) 03/23/2023   16:33:11  ( -69.50, 107.25)   53.10                70
 03/26/2023   07:09:57   ( -70.12,-111.32) 03/26/2023   07:10:32  ( -70.12,-111.28)    1.64                35
 03/26/2023   08:00:41   (  70.01,  56.16) 03/26/2023   07:59:59  (  70.02,  56.22)    2.53                42
 03/28/2023   22:36:13   (  70.52,-163.49) 03/28/2023   22:37:24  (  70.38,-162.64)   35.12                71
 03/28/2023   23:26:48   ( -70.06,   4.55) 03/28/2023   23:26:58  ( -70.05,   4.51)    1.73                10
 03/29/2023   00:17:32   (  69.95, 172.02) 03/29/2023   00:16:25  (  69.94, 172.00)    1.44                67
 03/31/2023   14:52:57   (  70.11, -47.07) 03/31/2023   14:53:53  (  70.11, -47.15)    2.98                56
 03/31/2023   15:43:39   ( -70.02, 120.39) 03/31/2023   15:43:23  ( -70.00, 120.33)    3.10                16
 03/31/2023   16:34:09   (  69.17, -71.06) 03/31/2023   16:33:02  (  69.22, -73.08)   79.77                67
 04/03/2023   07:09:47   (  70.09,  68.75) 04/03/2023   07:10:16  (  70.07,  68.70)    2.47                29
 04/03/2023   08:00:29   ( -69.99,-123.78) 04/03/2023   07:59:46  ( -69.97,-123.82)    2.68                43
 04/05/2023   22:35:58   ( -70.38,  16.77) 04/05/2023   22:37:10  ( -70.29,  17.26)   20.96                72
 04/05/2023   23:26:38   (  70.07,-175.44) 04/05/2023   23:26:39  (  70.06,-175.42)    1.48                 1
 04/06/2023   00:17:20   ( -69.97,  -7.97) 04/06/2023   00:16:09  ( -69.95,  -7.94)    2.21                71