Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 15.  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)
 04/16/2023   14:52:35   (  70.34, -47.35) 04/16/2023   14:53:46  (  70.26, -46.98)   16.67                71
 04/16/2023   15:43:14   ( -70.10, 120.34) 04/16/2023   15:43:17  ( -70.09, 120.41)    2.94                 3
 04/16/2023   16:33:57   (  69.93, -72.09) 04/16/2023   16:32:45  (  69.93, -72.16)    2.73                72
 04/19/2023   07:09:22   (  70.17,  68.70) 04/19/2023   07:10:15  (  70.17,  68.77)    3.01                53
 04/19/2023   08:00:03   ( -70.03,-123.77) 04/19/2023   07:59:45  ( -70.06,-123.75)    2.47                18
 04/19/2023   08:50:33   (  69.18,  44.78) 04/19/2023   08:49:25  (  69.23,  42.77)   79.58                68
 04/21/2023   23:26:10   (  70.13,-175.44) 04/21/2023   23:26:42  (  70.10,-175.45)    3.27                32
 04/22/2023   00:16:51   ( -69.98,  -7.91) 04/22/2023   00:16:12  ( -69.99,  -7.97)    2.16                39
 04/24/2023   14:52:24   ( -70.67, 132.18) 04/24/2023   14:53:34  ( -70.59, 133.52)   49.88                70
 04/24/2023   15:42:59   (  70.09, -59.60) 04/24/2023   15:43:08  (  70.10, -59.56)    1.70                 9
 04/24/2023   16:33:41   ( -70.00, 107.86) 04/24/2023   16:32:38  ( -69.99, 107.92)    2.59                63
 04/27/2023   07:09:04   ( -70.17,-111.24) 04/27/2023   07:10:07  ( -70.18,-111.20)    1.75                63
 04/27/2023   07:59:48   (  70.06,  56.23) 04/27/2023   07:59:34  (  70.06,  56.28)    1.72                14
 04/27/2023   08:50:22   ( -69.55,-135.69) 04/27/2023   08:49:11  ( -69.57,-136.76)   42.01                71