Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 17.  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)
 04/17/2023   23:01:05   (  70.59,-169.85) 04/17/2023   23:02:15  (  70.51,-168.67)   44.64                70
 04/17/2023   23:51:39   ( -70.08,  -1.74) 04/17/2023   23:51:51  ( -70.06,  -1.68)    3.32                12
 04/18/2023   00:42:22   (  69.91, 165.82) 04/18/2023   00:41:19  (  69.91, 165.75)    2.94                63
 04/20/2023   15:17:45   (  70.11, -53.32) 04/20/2023   15:18:50  (  70.11, -53.37)    1.82                65
 04/20/2023   16:08:27   ( -70.03, 114.13) 04/20/2023   16:08:20  ( -70.00, 114.11)    3.42                 7
 04/20/2023   16:59:04   (  69.54, -77.84) 04/20/2023   16:57:53  (  69.56, -78.85)   39.00                71
 04/23/2023   07:34:35   (  70.13,  62.44) 04/23/2023   07:35:18  (  70.11,  62.51)    3.32                43
 04/23/2023   08:25:16   ( -69.99,-130.02) 04/23/2023   08:24:48  ( -70.00,-130.01)    1.24                28
 04/25/2023   23:51:23   (  70.05, 178.35) 04/25/2023   23:51:46  (  70.06, 178.32)    1.40                23
 04/26/2023   00:42:05   ( -69.97, -14.20) 04/26/2023   00:41:16  ( -69.96, -14.19)    0.96                49
 04/28/2023   15:17:32   ( -70.36, 126.36) 04/28/2023   15:18:43  ( -70.31, 126.91)   21.48                71
 04/28/2023   16:08:12   (  70.05, -65.84) 04/28/2023   16:08:13  (  70.03, -65.84)    2.13                 1
 04/28/2023   16:58:53   ( -69.90, 101.69) 04/28/2023   16:57:43  ( -69.92, 101.64)    2.97                70
 05/01/2023   07:34:15   ( -70.10,-117.44) 05/01/2023   07:35:11  ( -70.12,-117.47)    2.17                56
 05/01/2023   08:24:59   (  70.00,  50.02) 05/01/2023   08:24:38  (  70.00,  50.01)    0.60                21