Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 17.  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)
 01/17/2023   06:45:11   ( -70.21,-105.06) 01/17/2023   06:46:22  ( -70.22,-104.91)    5.61                71
 01/17/2023   07:35:54   (  70.04,  62.51) 01/17/2023   07:35:50  (  70.06,  62.51)    2.34                 4
 01/17/2023   08:26:34   ( -69.84,-129.88) 01/17/2023   08:25:21  ( -69.89,-130.10)    9.51                73
 01/19/2023   23:02:03   ( -70.11,  10.86) 01/19/2023   23:02:50  ( -70.09,  10.80)    3.53                47
 01/19/2023   23:52:47   (  69.99, 178.35) 01/19/2023   23:52:17  (  69.98, 178.29)    2.90                30
 01/22/2023   14:28:26   (  70.85, -41.86) 01/22/2023   14:29:34  (  70.73, -39.99)   69.72                68
 01/22/2023   15:18:55   ( -70.07, 126.68) 01/22/2023   15:19:14  ( -70.08, 126.68)    0.32                19
 01/22/2023   16:09:39   (  69.96, -65.84) 01/22/2023   16:08:41  (  69.96, -65.84)    0.10                58
 01/25/2023   06:45:06   (  70.15,  75.03) 01/25/2023   06:46:09  (  70.13,  75.02)    2.32                63
 01/25/2023   07:35:47   ( -70.00,-117.43) 01/25/2023   07:35:39  ( -70.02,-117.50)    3.30                 8
 01/25/2023   08:26:23   (  69.47,  50.66) 01/25/2023   08:25:13  (  69.52,  49.45)   47.49                70
 01/27/2023   23:01:58   (  70.09,-169.12) 01/27/2023   23:02:33  (  70.08,-169.15)    1.64                35
 01/27/2023   23:52:40   ( -69.99,  -1.65) 01/27/2023   23:52:03  ( -69.98,  -1.66)    2.23                37
 01/30/2023   14:28:13   ( -70.52, 138.68) 01/30/2023   14:29:24  ( -70.44, 139.63)   36.38                71
 01/30/2023   15:18:50   (  70.05, -53.28) 01/30/2023   15:18:56  (  70.05, -53.29)    0.64                 6
 01/30/2023   16:09:32   ( -69.95, 114.19) 01/30/2023   16:08:26  ( -69.94, 114.19)    0.96                66