Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 3 31.  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)
 03/31/2023   14:52:57   (  70.13, -47.09) 03/31/2023   14:54:03  (  70.13, -47.17)    3.00                66
 03/31/2023   15:43:39   ( -70.04, 120.36) 03/31/2023   15:43:32  ( -70.06, 120.38)    2.64                 7
 03/31/2023   16:34:16   (  69.55, -71.61) 03/31/2023   16:33:05  (  69.63, -72.58)   38.46                71
 04/03/2023   07:09:47   (  70.11,  68.72) 04/03/2023   07:10:28  (  70.14,  68.73)    3.47                41
 04/03/2023   08:00:29   ( -70.02,-123.83) 04/03/2023   07:59:58  ( -70.03,-123.79)    1.44                31
 04/05/2023   22:36:08   ( -70.95,  15.85) 04/05/2023   22:37:15  ( -70.87,  18.05)   80.52                67
 04/05/2023   23:26:38   (  70.11,-175.49) 04/05/2023   23:26:54  (  70.10,-175.43)    2.39                16
 04/06/2023   00:17:19   ( -69.96,  -7.96) 04/06/2023   00:16:24  ( -69.99,  -7.95)    3.35                55
 04/08/2023   14:52:44   ( -70.17, 132.88) 04/08/2023   14:53:52  ( -70.18, 132.93)    2.38                68
 04/08/2023   15:43:28   (  70.07, -59.65) 04/08/2023   15:43:19  (  70.07, -59.59)    2.44                 9
 04/08/2023   16:34:05   ( -69.71, 108.20) 04/08/2023   16:32:53  ( -69.74, 107.59)   24.00                72
 04/11/2023   07:09:33   ( -70.09,-111.21) 04/11/2023   07:10:17  ( -70.11,-111.29)    3.48                44
 04/11/2023   08:00:17   (  69.99,  56.26) 04/11/2023   07:59:44  (  69.99,  56.19)    2.44                33
 04/13/2023   22:35:52   (  70.81,-163.88) 04/13/2023   22:37:00  (  70.68,-162.17)   63.86                68
 04/13/2023   23:26:22   ( -70.08,   4.60) 04/13/2023   23:26:39  ( -70.09,   4.58)    1.21                17
 04/14/2023   00:17:06   (  69.98, 172.06) 04/14/2023   00:16:06  (  69.97, 172.06)    1.12                60