Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 3 13.  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)
 03/14/2023   06:44:55   (  70.54,  74.34) 03/14/2023   06:46:05  (  70.41,  75.33)   39.33                70
 03/14/2023   07:35:29   ( -70.03,-117.54) 03/14/2023   07:35:40  ( -70.03,-117.59)    1.74                11
 03/14/2023   08:26:13   (  69.92,  49.94) 03/14/2023   08:25:07  (  69.92,  49.91)    1.43                66
 03/16/2023   23:01:40   (  70.12,-169.22) 03/16/2023   23:02:39  (  70.13,-169.21)    1.21                59
 03/16/2023   23:52:22   ( -70.02,  -1.76) 03/16/2023   23:52:09  ( -70.02,  -1.73)    1.23                13
 03/17/2023   00:42:55   (  69.33, 166.57) 03/17/2023   00:41:46  (  69.36, 165.01)   61.15                69
 03/19/2023   15:18:32   (  70.08, -53.38) 03/19/2023   15:19:08  (  70.06, -53.42)    2.30                36
 03/19/2023   16:09:14   ( -69.98, 114.08) 03/19/2023   16:08:38  ( -69.96, 114.06)    2.70                36
 03/22/2023   06:44:51   ( -70.73,-105.95) 03/22/2023   06:46:00  ( -70.61,-104.39)   59.14                69
 03/22/2023   07:35:24   (  70.05,  62.43) 03/22/2023   07:35:35  (  70.05,  62.45)    0.69                11
 03/22/2023   08:26:06   ( -69.95,-130.10) 03/22/2023   08:25:05  ( -69.95,-130.06)    1.71                61
 03/24/2023   23:01:30   ( -70.10,  10.83) 03/24/2023   23:02:34  ( -70.11,  10.77)    2.88                64
 03/24/2023   23:52:14   (  69.99, 178.30) 03/24/2023   23:52:01  (  69.99, 178.25)    1.79                13
 03/25/2023   00:42:48   ( -69.47, -13.62) 03/25/2023   00:41:37  ( -69.56, -14.71)   43.73                71