Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 21.  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)
 07/24/2023   07:09:11   (  71.00,  67.33) 07/24/2023   07:10:16  (  70.90,  69.98)   96.82                65
 07/24/2023   07:59:35   ( -69.96,-123.69) 07/24/2023   08:00:01  ( -69.97,-123.76)    2.99                26
 07/24/2023   08:50:19   (  69.85,  43.78) 07/24/2023   08:49:28  (  69.87,  43.74)    2.43                51
 07/26/2023   23:25:48   (  70.23,-175.66) 07/26/2023   23:27:00  (  70.16,-175.25)   17.56                72
 07/27/2023   00:16:26   ( -69.93,  -7.87) 07/27/2023   00:16:32  ( -69.94,  -7.92)    2.83                 6
 07/27/2023   01:07:10   (  69.82, 159.60) 07/27/2023   01:05:59  (  69.83, 159.57)    1.85                71
 07/29/2023   15:42:37   (  70.06, -59.60) 07/29/2023   15:43:33  (  70.05, -59.53)    2.96                56
 07/29/2023   16:33:18   ( -69.90, 107.94) 07/29/2023   16:33:04  ( -69.89, 107.89)    2.39                14
 07/29/2023   17:23:50   (  69.16, -83.68) 07/29/2023   17:22:41  (  69.23, -85.37)   67.31                69
 08/01/2023   07:59:28   (  69.99,  56.28) 08/01/2023   08:00:05  (  69.98,  56.25)    1.49                37
 08/01/2023   08:50:10   ( -69.89,-136.25) 08/01/2023   08:49:35  ( -69.88,-136.26)    0.62                35
 08/03/2023   23:25:50   ( -70.81,   3.44) 08/03/2023   23:26:57  ( -70.71,   5.56)   78.25                67
 08/04/2023   00:16:19   (  69.93, 172.14) 08/04/2023   00:16:36  (  69.94, 172.08)    2.97                17
 08/04/2023   01:07:01   ( -69.83, -20.38) 08/04/2023   01:06:06  ( -69.85, -20.43)    2.87                55