Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 2 7.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 02/07/2023   15:18:43   ( -70.13, 126.60) 02/07/2023   15:19:31  ( -70.14, 126.67)    2.62                48
 02/07/2023   16:09:27   (  70.01, -65.91) 02/07/2023   16:08:59  (  69.99, -65.90)    3.22                28
 02/10/2023   07:35:35   ( -70.11,-117.59) 02/10/2023   07:36:01  ( -70.10,-117.51)    3.09                26
 02/10/2023   08:26:18   (  69.94,  49.97) 02/10/2023   08:25:29  (  69.94,  49.91)    2.47                49
 02/12/2023   23:01:47   (  70.35,-169.50) 02/12/2023   23:02:58  (  70.25,-169.06)   20.09                71
 02/12/2023   23:52:25   ( -70.05,  -1.71) 02/12/2023   23:52:30  ( -70.03,  -1.74)    2.34                 5
 02/13/2023   00:43:09   (  69.94, 165.76) 02/13/2023   00:41:57  (  69.92, 165.76)    1.79                72
 02/15/2023   15:18:35   (  70.14, -53.40) 02/15/2023   15:19:28  (  70.14, -53.33)    2.57                53
 02/15/2023   16:09:16   ( -69.99, 114.14) 02/15/2023   16:08:59  ( -69.98, 114.08)    3.04                17
 02/15/2023   16:59:46   (  69.14, -77.31) 02/15/2023   16:58:38  (  69.20, -79.33)   80.03                68
 02/18/2023   07:35:26   (  70.10,  62.45) 02/18/2023   07:35:56  (  70.11,  62.52)    3.23                30
 02/18/2023   08:26:07   ( -69.95,-130.01) 02/18/2023   08:25:27  ( -69.95,-130.08)    2.56                40
 02/20/2023   23:01:41   ( -70.59,  10.15) 02/20/2023   23:02:51  ( -70.50,  11.32)   44.38                70
 02/20/2023   23:52:17   (  70.07, 178.27) 02/20/2023   23:52:24  (  70.06, 178.32)    2.15                 7
 02/21/2023   00:42:59   ( -69.97, -14.26) 02/21/2023   00:41:54  ( -69.95, -14.19)    3.02                65