Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 3 30.  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   (  70.16, -47.14) 03/31/2023   14:54:02  (  70.15, -47.14)    0.94                65
 03/31/2023   15:43:38   ( -70.02, 120.40) 03/31/2023   15:43:32  ( -70.03, 120.33)    2.96                 6
 03/31/2023   16:34:16   (  69.59, -71.66) 03/31/2023   16:33:05  (  69.60, -72.62)   37.50                71
 04/03/2023   07:09:48   (  70.14,  68.67) 04/03/2023   07:10:29  (  70.11,  68.70)    2.80                41
 04/03/2023   08:00:29   ( -70.00,-123.79) 04/03/2023   07:59:59  ( -70.00,-123.83)    1.61                30
 04/05/2023   22:36:09   ( -70.97,  15.81) 04/05/2023   22:37:16  ( -70.85,  18.03)   81.85                67
 04/05/2023   23:26:38   (  70.08,-175.45) 04/05/2023   23:26:55  (  70.09,-175.45)    0.87                17
 04/06/2023   00:17:20   ( -69.99,  -8.00) 04/06/2023   00:16:25  ( -69.98,  -7.97)    1.34                55
 04/08/2023   14:52:44   ( -70.14, 132.93) 04/08/2023   14:53:54  ( -70.13, 132.85)    3.10                70
 04/08/2023   15:43:27   (  70.04, -59.60) 04/08/2023   15:43:20  (  70.02, -59.67)    3.28                 7
 04/08/2023   16:34:05   ( -69.73, 108.17) 04/08/2023   16:32:52  ( -69.80, 107.67)   20.82                73
 04/11/2023   07:09:33   ( -70.11,-111.24) 04/11/2023   07:10:17  ( -70.13,-111.26)    1.94                44
 04/11/2023   08:00:17   (  70.01,  56.22) 04/11/2023   07:59:44  (  70.01,  56.22)    0.27                33