Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2022 12 27.  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)
 12/29/2022   14:28:37   ( -71.14, 137.71) 12/29/2022   14:29:43  ( -71.04, 140.44)   98.99                66
 12/29/2022   15:19:04   (  70.13, -53.36) 12/29/2022   15:19:25  (  70.11, -53.30)    2.87                21
 12/29/2022   16:09:45   ( -69.99, 114.18) 12/29/2022   16:08:55  ( -70.01, 114.19)    1.98                50
 01/01/2023   06:45:16   ( -70.29,-105.14) 01/01/2023   06:46:27  ( -70.27,-104.84)   11.45                71
 01/01/2023   07:35:58   (  70.07,  62.50) 01/01/2023   07:35:56  (  70.05,  62.49)    2.31                 2
 01/01/2023   08:26:39   ( -69.92,-129.96) 01/01/2023   08:25:26  ( -69.94,-130.03)    3.29                73
 01/03/2023   23:02:08   ( -70.12,  10.87) 01/03/2023   23:02:59  ( -70.13,  10.83)    1.55                51
 01/03/2023   23:52:52   (  70.01, 178.35) 01/03/2023   23:52:26  (  70.02, 178.32)    1.28                26
 01/04/2023   00:43:18   ( -69.07, -12.97) 01/04/2023   00:42:11  ( -69.09, -15.30)   92.49                67
 01/06/2023   14:28:38   (  71.11, -42.28) 01/06/2023   14:29:44  (  71.00, -39.62)   96.80                66
 01/06/2023   15:19:02   ( -70.07, 126.71) 01/06/2023   15:19:29  ( -70.08, 126.64)    2.94                27
 01/06/2023   16:09:46   (  69.96, -65.81) 01/06/2023   16:08:56  (  69.96, -65.88)    2.68                50
 01/09/2023   06:45:15   (  70.23,  74.92) 01/09/2023   06:46:26  (  70.21,  75.07)    6.51                71
 01/09/2023   07:35:56   ( -70.08,-117.53) 01/09/2023   07:35:57  ( -70.06,-117.51)    2.67                 1
 01/09/2023   08:26:38   (  69.87,  50.09) 01/09/2023   08:25:25  (  69.88,  49.89)    7.99                73