Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 31.  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)
 02/02/2023   06:45:12   ( -70.86,-106.11) 02/02/2023   06:46:20  ( -70.76,-104.16)   71.99                68
 02/02/2023   07:35:43   (  70.06,  62.47) 02/02/2023   07:35:58  (  70.06,  62.45)    0.91                15
 02/02/2023   08:26:24   ( -69.93,-130.00) 02/02/2023   08:25:28  ( -69.95,-130.07)    3.39                56
 02/04/2023   23:01:51   ( -70.14,  10.82) 02/04/2023   23:03:02  ( -70.13,  10.79)    1.42                71
 02/04/2023   23:52:35   (  70.02, 178.30) 02/04/2023   23:52:29  (  70.03, 178.28)    0.82                 6
 02/05/2023   00:43:14   ( -69.78, -14.01) 02/05/2023   00:42:01  ( -69.81, -14.39)   15.03                73
 02/07/2023   15:18:42   ( -70.10, 126.65) 02/07/2023   15:19:32  ( -70.09, 126.59)    2.59                50
 02/07/2023   16:09:26   (  69.99, -65.87) 02/07/2023   16:08:59  (  69.98, -65.91)    1.88                27
 02/07/2023   16:59:51   ( -69.00, 102.87) 02/07/2023   16:58:44  ( -69.05, 100.47)   96.00                67
 02/10/2023   07:35:34   ( -70.07,-117.53) 02/10/2023   07:36:02  ( -70.08,-117.55)    1.22                28
 02/10/2023   08:26:18   (  69.96,  49.94) 02/10/2023   08:25:29  (  69.97,  49.94)    0.52                49
 02/12/2023   23:01:48   (  70.35,-169.51) 02/12/2023   23:03:00  (  70.26,-169.04)   20.35                72
 02/12/2023   23:52:26   ( -70.04,  -1.71) 02/12/2023   23:52:32  ( -70.05,  -1.71)    0.34                 6
 02/13/2023   00:43:10   (  69.94, 165.75) 02/13/2023   00:41:59  (  69.93, 165.77)    1.05                71