Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2022 12 28.  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   15:19:04   (  70.11, -53.32) 12/29/2022   15:19:26  (  70.08, -53.34)    2.72                22
 12/29/2022   16:09:45   ( -69.97, 114.21) 12/29/2022   16:08:56  ( -69.97, 114.14)    2.84                49
 01/01/2023   06:45:16   ( -70.27,-105.11) 01/01/2023   06:46:28  ( -70.24,-104.89)    8.87                72
 01/01/2023   07:35:58   (  70.05,  62.54) 01/01/2023   07:35:56  (  70.07,  62.52)    3.02                 2
 01/01/2023   08:26:40   ( -69.96,-130.01) 01/01/2023   08:25:26  ( -69.97,-130.00)    1.31                74
 01/03/2023   23:02:08   ( -70.16,  10.82) 01/03/2023   23:02:58  ( -70.15,  10.86)    1.65                50
 01/03/2023   23:52:52   (  70.04, 178.30) 01/03/2023   23:52:25  (  70.04, 178.35)    1.83                27
 01/04/2023   00:43:17   ( -69.05, -12.94) 01/04/2023   00:42:10  ( -69.11, -15.27)   92.80                67
 01/06/2023   14:28:37   (  71.09, -42.25) 01/06/2023   14:29:43  (  71.02, -39.59)   96.18                66
 01/06/2023   15:19:02   ( -70.11, 126.66) 01/06/2023   15:19:28  ( -70.10, 126.67)    1.03                26
 01/06/2023   16:09:46   (  70.00, -65.86) 01/06/2023   16:08:55  (  69.98, -65.85)    1.75                51
 01/09/2023   06:45:15   (  70.21,  74.94) 01/09/2023   06:46:27  (  70.17,  75.02)    5.39                72
 01/09/2023   07:35:56   ( -70.06,-117.51) 01/09/2023   07:35:57  ( -70.08,-117.48)    1.65                 1
 01/09/2023   08:26:38   (  69.85,  50.12) 01/09/2023   08:25:25  (  69.90,  49.92)    9.79                73