Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2022 12 25.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 12/25/2022   14:53:42   (  70.13, -47.00) 12/25/2022   14:54:39  (  70.15, -47.06)    3.20                57
 12/25/2022   15:44:24   ( -70.05, 120.45) 12/25/2022   15:44:09  ( -70.04, 120.41)    1.54                15
 12/25/2022   16:34:55   (  69.24, -71.06) 12/25/2022   16:33:47  (  69.33, -72.92)   73.73                68
 12/28/2022   07:10:37   (  70.11,  68.79) 12/28/2022   07:11:10  (  70.10,  68.73)    2.92                33
 12/28/2022   08:01:19   ( -70.03,-123.76) 12/28/2022   08:00:39  ( -70.05,-123.71)    2.78                40
 12/30/2022   22:36:55   ( -70.63,  16.43) 12/30/2022   22:38:05  ( -70.57,  17.65)   45.73                70
 12/30/2022   23:27:31   (  70.10,-175.43) 12/30/2022   23:27:39  (  70.08,-175.42)    2.42                 8
 12/31/2022   00:18:12   ( -69.96,  -7.89) 12/31/2022   00:17:09  ( -69.98,  -7.94)    2.68                63
 01/02/2023   14:53:41   ( -70.15, 132.95) 01/02/2023   14:54:42  ( -70.16, 132.92)    1.28                61
 01/02/2023   15:44:25   (  70.04, -59.57) 01/02/2023   15:44:09  (  70.04, -59.60)    0.92                16
 01/02/2023   16:34:57   ( -69.42, 108.66) 01/02/2023   16:33:47  ( -69.50, 107.29)   54.30                70
 01/05/2023   07:10:35   ( -70.09,-111.20) 01/05/2023   07:11:12  ( -70.11,-111.28)    3.18                37
 01/05/2023   08:01:19   (  69.99,  56.27) 01/05/2023   08:00:39  (  69.99,  56.21)    2.59                40
 01/07/2023   22:36:55   (  70.56,-163.49) 01/07/2023   22:38:06  (  70.46,-162.51)   37.98                71
 01/07/2023   23:27:30   ( -70.09,   4.56) 01/07/2023   23:27:41  ( -70.09,   4.58)    0.86                11
 01/08/2023   00:18:14   (  69.99, 172.03) 01/08/2023   00:17:08  (  69.97, 172.06)    2.16                66