Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 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)
 04/23/2023   07:34:35   (  70.13,  62.45) 04/23/2023   07:35:18  (  70.12,  62.53)    2.98                43
 04/23/2023   08:25:16   ( -69.99,-130.02) 04/23/2023   08:24:48  ( -70.01,-130.00)    2.49                28
 04/25/2023   23:51:23   (  70.05, 178.36) 04/25/2023   23:51:47  (  70.04, 178.29)    2.97                24
 04/26/2023   00:42:05   ( -69.96, -14.19) 04/26/2023   00:41:16  ( -69.98, -14.16)    2.94                49
 04/28/2023   15:17:33   ( -70.40, 126.30) 04/28/2023   15:18:44  ( -70.30, 126.90)   25.13                71
 04/28/2023   16:08:12   (  70.03, -65.82) 04/28/2023   16:08:14  (  70.03, -65.85)    1.18                 2
 04/28/2023   16:58:54   ( -69.94, 101.63) 04/28/2023   16:57:44  ( -69.92, 101.63)    2.61                70
 05/01/2023   07:34:16   ( -70.13,-117.49) 05/01/2023   07:35:12  ( -70.14,-117.45)    2.06                56
 05/01/2023   08:25:00   (  70.02,  49.98) 05/01/2023   08:24:39  (  70.03,  50.04)    2.32                21
 05/01/2023   09:15:29   ( -69.25,-141.57) 05/01/2023   09:14:20  ( -69.32,-143.30)   68.54                69
 05/03/2023   23:51:04   ( -70.08,  -1.63) 05/03/2023   23:51:38  ( -70.11,  -1.61)    2.67                34
 05/04/2023   00:41:48   (  69.98, 165.84) 05/04/2023   00:41:05  (  69.99, 165.87)    1.70                43