Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 21.  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)
 04/21/2023   23:26:10   (  70.13,-175.45) 04/21/2023   23:26:44  (  70.13,-175.41)    1.55                34
 04/22/2023   00:16:51   ( -69.99,  -7.92) 04/22/2023   00:16:14  ( -70.02,  -7.93)    2.93                37
 04/24/2023   14:52:29   ( -70.94, 131.73) 04/24/2023   14:53:36  ( -70.83, 133.85)   77.97                67
 04/24/2023   15:42:59   (  70.09, -59.61) 04/24/2023   15:43:15  (  70.07, -59.63)    2.81                16
 04/24/2023   16:33:40   ( -69.96, 107.92) 04/24/2023   16:32:45  ( -69.96, 107.86)    2.54                55
 04/27/2023   07:09:05   ( -70.23,-111.34) 04/27/2023   07:10:17  ( -70.23,-111.18)    6.10                72
 04/27/2023   07:59:48   (  70.07,  56.22) 04/27/2023   07:59:45  (  70.06,  56.23)    1.14                 3
 04/27/2023   08:50:29   ( -69.93,-136.25) 04/27/2023   08:49:15  ( -69.96,-136.28)    3.22                74
 04/29/2023   23:25:53   ( -70.17,   4.55) 04/29/2023   23:26:48  ( -70.17,   4.60)    1.89                55
 04/30/2023   00:16:37   (  70.06, 172.02) 04/30/2023   00:16:15  (  70.06, 172.09)    2.52                22
 04/30/2023   01:07:05   ( -69.23, -19.44) 04/30/2023   01:05:57  ( -69.29, -21.32)   74.10                68
 05/02/2023   15:42:40   ( -70.11, 120.43) 05/02/2023   15:43:18  ( -70.11, 120.38)    1.93                38
 05/02/2023   16:33:24   (  70.01, -72.11) 05/02/2023   16:32:45  (  69.99, -72.14)    2.47                39