Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 17.  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)
 04/19/2023   07:09:21   (  70.16,  68.71) 04/19/2023   07:10:14  (  70.17,  68.78)    2.92                53
 04/19/2023   08:00:02   ( -70.03,-123.76) 04/19/2023   07:59:45  ( -70.01,-123.82)    3.34                17
 04/19/2023   08:50:32   (  69.17,  44.80) 04/19/2023   08:49:24  (  69.24,  42.78)   79.89                68
 04/21/2023   23:26:10   (  70.12,-175.43) 04/21/2023   23:26:42  (  70.09,-175.45)    3.10                32
 04/22/2023   00:16:51   ( -69.98,  -7.90) 04/22/2023   00:16:12  ( -69.98,  -7.97)    2.65                39
 04/24/2023   14:52:24   ( -70.67, 132.18) 04/24/2023   14:53:34  ( -70.57, 133.49)   49.29                70
 04/24/2023   15:42:59   (  70.09, -59.59) 04/24/2023   15:43:08  (  70.08, -59.58)    0.91                 9
 04/24/2023   16:33:41   ( -70.00, 107.86) 04/24/2023   16:32:38  ( -69.97, 107.90)    3.18                63
 04/27/2023   07:09:04   ( -70.17,-111.24) 04/27/2023   07:10:07  ( -70.14,-111.25)    3.45                63
 04/27/2023   07:59:47   (  70.01,  56.31) 04/27/2023   07:59:34  (  70.03,  56.23)    3.21                13
 04/27/2023   08:50:21   ( -69.50,-135.62) 04/27/2023   08:49:10  ( -69.59,-136.74)   44.78                71
 04/29/2023   23:25:51   ( -70.11,   4.64) 04/29/2023   23:26:31  ( -70.10,   4.59)    2.30                40
 04/30/2023   00:16:35   (  70.01, 172.11) 04/30/2023   00:15:58  (  69.98, 172.06)    3.07                37