Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 3 20.  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)
 03/22/2023   06:44:51   ( -70.75,-105.98) 03/22/2023   06:46:00  ( -70.61,-104.39)   60.35                69
 03/22/2023   07:35:24   (  70.06,  62.42) 03/22/2023   07:35:35  (  70.06,  62.46)    1.61                11
 03/22/2023   08:26:06   ( -69.97,-130.13) 03/22/2023   08:25:05  ( -69.95,-130.06)    3.18                61
 03/24/2023   23:01:32   ( -70.14,  10.76) 03/24/2023   23:02:35  ( -70.15,  10.83)    2.95                63
 03/24/2023   23:52:15   (  69.98, 178.31) 03/24/2023   23:52:03  (  69.99, 178.24)    2.77                12
 03/25/2023   00:42:50   ( -69.52, -13.69) 03/25/2023   00:41:39  ( -69.55, -14.73)   40.57                71
 03/27/2023   15:18:23   ( -70.08, 126.64) 03/27/2023   15:19:02  ( -70.10, 126.64)    2.69                39
 03/27/2023   16:09:06   (  69.97, -65.89) 03/27/2023   16:08:28  (  69.99, -65.87)    2.06                38
 03/30/2023   06:44:41   (  70.64,  74.21) 03/30/2023   06:45:50  (  70.55,  75.56)   50.89                69
 03/30/2023   07:35:14   ( -70.07,-117.58) 03/30/2023   07:35:27  ( -70.07,-117.52)    2.33                13
 03/30/2023   08:25:58   (  69.97,  49.89) 03/30/2023   08:24:54  (  69.95,  49.96)    3.56                64
 04/01/2023   23:01:23   (  70.13,-169.20) 04/01/2023   23:02:22  (  70.15,-169.14)    3.49                59
 04/01/2023   23:52:05   ( -70.03,  -1.73) 04/01/2023   23:51:52  ( -70.05,  -1.65)    3.64                13
 04/02/2023   00:42:38   (  69.34, 166.58) 04/02/2023   00:41:29  (  69.38, 165.07)   59.40                69