Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 5.  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)
 04/07/2023   07:35:03   (  70.07,  62.45) 04/07/2023   07:35:25  (  70.08,  62.48)    1.38                22
 04/07/2023   08:25:45   ( -69.98,-130.10) 04/07/2023   08:24:55  ( -69.96,-130.05)    2.92                50
 04/09/2023   23:01:13   ( -70.34,  10.51) 04/09/2023   23:02:24  ( -70.27,  10.98)   19.80                71
 04/09/2023   23:51:53   (  70.02, 178.31) 04/09/2023   23:51:53  (  70.05, 178.32)    3.43                 0
 04/10/2023   00:42:35   ( -69.93, -14.24) 04/10/2023   00:41:23  ( -69.94, -14.20)    1.68                72
 04/12/2023   15:17:59   ( -70.09, 126.68) 04/12/2023   15:18:54  ( -70.10, 126.63)    2.17                55
 04/12/2023   16:08:43   (  69.98, -65.85) 04/12/2023   16:08:21  (  69.99, -65.88)    1.56                22
 04/12/2023   16:59:11   ( -69.15, 102.68) 04/12/2023   16:58:03  ( -69.22, 100.71)   78.14                68
 04/15/2023   07:34:48   ( -70.06,-117.49) 04/15/2023   07:35:20  ( -70.06,-117.54)    2.06                32
 04/15/2023   08:25:32   (  69.95,  49.98) 04/15/2023   08:24:47  (  69.95,  49.94)    1.65                45
 04/17/2023   23:01:02   (  70.45,-169.63) 04/17/2023   23:02:13  (  70.31,-168.93)   30.49                71
 04/17/2023   23:51:38   ( -70.04,  -1.67) 04/17/2023   23:51:46  ( -70.04,  -1.68)    0.46                 8
 04/18/2023   00:42:22   (  69.94, 165.79) 04/18/2023   00:41:13  (  69.92, 165.80)    1.36                69