Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 28.  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)
 04/29/2023   23:26:01   ( -70.11,   4.61) 04/29/2023   23:26:44  ( -70.13,   4.56)    2.95                43
 04/30/2023   00:16:46   (  70.04, 172.02) 04/30/2023   00:16:11  (  70.02, 172.06)    1.92                35
 05/02/2023   14:52:26   (  70.71, -47.91) 05/02/2023   14:53:35  (  70.59, -46.52)   53.02                69
 05/02/2023   15:42:58   ( -70.10, 120.38) 05/02/2023   15:43:12  ( -70.10, 120.40)    0.89                14
 05/02/2023   16:33:42   (  69.98, -72.13) 05/02/2023   16:32:39  (  69.99, -72.11)    1.87                63
 05/05/2023   07:09:12   (  70.14,  68.76) 05/05/2023   07:10:10  (  70.15,  68.72)    2.26                58
 05/05/2023   07:59:54   ( -70.05,-123.79) 05/05/2023   07:59:40  ( -70.04,-123.80)    0.69                14
 05/05/2023   08:50:26   (  69.29,  44.63) 05/05/2023   08:49:18  (  69.32,  42.86)   69.59                68
 05/07/2023   23:26:07   (  70.10,-175.42) 05/07/2023   23:26:36  (  70.12,-175.45)    2.46                29
 05/08/2023   00:16:49   ( -70.00,  -7.96) 05/08/2023   00:16:06  ( -70.01,  -7.96)    0.84                43
 05/10/2023   14:52:22   ( -70.34, 132.66) 05/10/2023   14:53:34  ( -70.28, 133.03)   15.06                72
 05/10/2023   15:43:03   (  70.07, -59.61) 05/10/2023   15:43:03  (  70.05, -59.65)    2.12                 0
 05/10/2023   16:33:45   ( -69.97, 107.85) 05/10/2023   16:32:33  ( -69.95, 107.84)    2.35                72