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   06:44:37   ( -71.10,-106.52) 04/07/2023   06:45:43  ( -71.02,-103.76)   99.79                66
 04/07/2023   07:35:03   (  70.04,  62.49) 04/07/2023   07:35:26  (  70.04,  62.43)    2.13                23
 04/07/2023   08:25:45   ( -69.96,-130.06) 04/07/2023   08:24:56  ( -69.93,-130.09)    3.15                49
 04/09/2023   23:01:12   ( -70.32,  10.54) 04/09/2023   23:02:24  ( -70.23,  10.93)   17.48                72
 04/09/2023   23:51:52   (  70.00, 178.35) 04/09/2023   23:51:53  (  70.01, 178.27)    3.47                 1
 04/10/2023   00:42:34   ( -69.91, -14.20) 04/10/2023   00:41:23  ( -69.90, -14.25)    1.91                71
 04/12/2023   15:17:59   ( -70.12, 126.64) 04/12/2023   15:18:53  ( -70.11, 126.64)    0.94                54
 04/12/2023   16:08:43   (  70.01, -65.89) 04/12/2023   16:08:20  (  70.00, -65.87)    1.60                23
 04/12/2023   16:59:11   ( -69.18, 102.64) 04/12/2023   16:58:02  ( -69.23, 100.72)   75.71                69
 04/15/2023   07:34:49   ( -70.09,-117.53) 04/15/2023   07:35:20  ( -70.06,-117.54)    2.90                31
 04/15/2023   08:25:32   (  69.93,  50.01) 04/15/2023   08:24:47  (  69.95,  49.95)    3.27                45
 04/17/2023   23:01:02   (  70.43,-169.59) 04/17/2023   23:02:13  (  70.30,-168.94)   28.22                71
 04/17/2023   23:51:38   ( -70.01,  -1.64) 04/17/2023   23:51:46  ( -70.03,  -1.70)    2.81                 8
 04/18/2023   00:42:22   (  69.91, 165.83) 04/18/2023   00:41:13  (  69.91, 165.79)    1.59                69