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   (  70.14,  68.75) 04/19/2023   07:10:15  (  70.15,  68.75)    1.13                54
 04/19/2023   08:00:03   ( -70.05,-123.80) 04/19/2023   07:59:45  ( -70.03,-123.78)    2.44                18
 04/19/2023   08:50:32   (  69.14,  44.83) 04/19/2023   08:49:25  (  69.21,  42.75)   82.80                67
 04/21/2023   23:26:10   (  70.09,-175.39) 04/21/2023   23:26:42  (  70.12,-175.41)    3.11                32
 04/22/2023   00:16:52   ( -70.01,  -7.95) 04/22/2023   00:16:12  ( -70.01,  -7.93)    0.58                40
 04/24/2023   14:52:24   ( -70.70, 132.13) 04/24/2023   14:53:33  ( -70.60, 133.53)   52.59                69
 04/24/2023   15:42:58   (  70.06, -59.56) 04/24/2023   15:43:08  (  70.05, -59.62)    2.64                10
 04/24/2023   16:33:40   ( -69.98, 107.89) 04/24/2023   16:32:37  ( -70.00, 107.94)    3.18                63
 04/27/2023   07:09:03   ( -70.15,-111.22) 04/27/2023   07:10:06  ( -70.17,-111.22)    1.48                63
 04/27/2023   07:59:47   (  70.05,  56.26) 04/27/2023   07:59:33  (  70.05,  56.27)    0.64                14
 04/27/2023   08:50:21   ( -69.53,-135.67) 04/27/2023   08:49:10  ( -69.56,-136.78)   43.27                71
 04/29/2023   23:25:52   ( -70.15,   4.58) 04/29/2023   23:26:31  ( -70.13,   4.62)    2.75                39
 04/30/2023   00:16:35   (  69.99, 172.13) 04/30/2023   00:15:58  (  70.01, 172.10)    2.20                37