Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 30.  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)
 05/01/2023   07:34:29   ( -70.10,-117.51) 05/01/2023   07:35:12  ( -70.11,-117.49)    1.39                43
 05/01/2023   08:25:13   (  69.98,  49.99) 05/01/2023   08:24:40  (  69.96,  49.94)    3.12                33
 05/03/2023   23:00:53   (  70.66,-169.94) 05/03/2023   23:02:02  (  70.54,-168.61)   50.93                69
 05/03/2023   23:51:25   ( -70.05,  -1.66) 05/03/2023   23:51:39  ( -70.04,  -1.70)    1.40                14
 05/04/2023   00:42:09   (  69.92, 165.83) 05/04/2023   00:41:06  (  69.94, 165.80)    2.03                63
 05/06/2023   15:17:40   (  70.14, -53.36) 05/06/2023   15:18:35  (  70.11, -53.34)    2.86                55
 05/06/2023   16:08:21   ( -70.00, 114.17) 05/06/2023   16:08:05  ( -70.00, 114.13)    1.55                16
 05/06/2023   16:58:52   (  69.19, -77.34) 05/06/2023   16:57:44  (  69.23, -79.27)   76.25                68
 05/09/2023   07:34:36   (  70.10,  62.45) 05/09/2023   07:35:00  (  70.10,  62.52)    2.72                24
 05/09/2023   08:25:17   ( -69.96,-130.01) 05/09/2023   08:24:30  ( -69.99,-130.00)    3.37                47
 05/11/2023   23:00:46   ( -70.13,  10.85) 05/11/2023   23:01:58  ( -70.11,  10.79)    3.20                72
 05/11/2023   23:51:30   (  70.02, 178.34) 05/11/2023   23:51:25  (  70.00, 178.28)    3.27                 5
 05/12/2023   00:42:09   ( -69.77, -13.97) 05/12/2023   00:40:56  ( -69.84, -14.32)   15.30                73