Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 29.  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)
 10/29/2023   16:07:54   ( -69.93, 114.16) 10/29/2023   16:08:41  ( -69.94, 114.13)    2.40                47
 10/29/2023   16:58:39   (  69.86, -78.44) 10/29/2023   16:58:08  (  69.84, -78.37)    3.01                31
 11/01/2023   07:34:22   (  70.57,  61.59) 11/01/2023   07:35:31  (  70.41,  63.06)   57.11                69
 11/01/2023   08:24:53   ( -69.89,-130.04) 11/01/2023   08:25:08  ( -69.91,-130.03)    2.36                15
 11/01/2023   09:15:37   (  69.77,  37.44) 11/01/2023   09:14:36  (  69.75,  37.40)    3.16                61
 11/03/2023   23:51:10   (  69.97, 178.28) 11/03/2023   23:52:05  (  69.95, 178.29)    2.01                55
 11/04/2023   00:41:52   ( -69.87, -14.25) 11/04/2023   00:41:35  ( -69.84, -14.23)    3.41                17
 11/04/2023   01:32:22   (  69.01, 154.29) 11/04/2023   01:31:14  (  69.06, 152.38)   76.22                68
 11/06/2023   16:08:07   (  69.90, -65.87) 11/06/2023   16:08:30  (  69.89, -65.90)    2.35                23
 11/06/2023   16:58:49   ( -69.80, 101.60) 11/06/2023   16:58:00  ( -69.78, 101.58)    2.88                49
 11/09/2023   07:34:21   ( -69.96,-117.51) 11/09/2023   07:35:28  ( -69.95,-117.55)    1.84                67
 11/09/2023   08:25:05   (  69.85,  49.96) 11/09/2023   08:24:55  (  69.84,  49.93)    2.10                10
 11/09/2023   09:15:41   ( -69.43,-142.10) 11/09/2023   09:14:29  ( -69.51,-142.88)   31.56                72
 11/11/2023   23:51:19   ( -69.91,  -1.69) 11/11/2023   23:51:52  ( -69.92,  -1.69)    0.63                33
 11/12/2023   00:42:03   (  69.81, 165.77) 11/12/2023   00:41:19  (  69.80, 165.79)    1.46                44