Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 13.  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)
 05/14/2023   15:17:42   ( -70.11, 126.65) 05/14/2023   15:18:38  ( -70.11, 126.61)    1.61                56
 05/14/2023   16:08:26   (  69.99, -65.85) 05/14/2023   16:08:05  (  70.01, -65.89)    2.30                21
 05/14/2023   16:58:55   ( -69.22, 102.58) 05/14/2023   16:57:46  ( -69.28, 100.77)   71.92                69
 05/17/2023   07:34:37   ( -70.05,-117.50) 05/17/2023   07:35:06  ( -70.07,-117.57)    2.92                29
 05/17/2023   08:25:22   (  69.98,  49.92) 05/17/2023   08:24:33  (  69.96,  49.93)    2.59                49
 05/19/2023   23:00:52   (  70.20,-169.27) 05/19/2023   23:02:03  (  70.16,-169.19)    5.30                71
 05/19/2023   23:51:32   ( -70.06,  -1.74) 05/19/2023   23:51:32  ( -70.05,  -1.71)    1.46                 0
 05/20/2023   00:42:13   (  69.78, 165.99) 05/20/2023   00:41:01  (  69.83, 165.63)   15.02                72
 05/22/2023   15:17:45   (  70.10, -53.37) 05/22/2023   15:18:29  (  70.10, -53.39)    0.95                44
 05/22/2023   16:08:27   ( -70.02, 114.09) 05/22/2023   16:07:59  ( -69.99, 114.10)    2.60                28
 05/25/2023   06:44:09   ( -70.87,-106.13) 05/25/2023   06:45:17  ( -70.78,-104.14)   73.31                68
 05/25/2023   07:34:40   (  70.08,  62.44) 05/25/2023   07:34:55  (  70.06,  62.45)    1.59                15
 05/25/2023   08:25:22   ( -69.98,-130.10) 05/25/2023   08:24:25  ( -69.96,-130.06)    3.22                57