Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 28.  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)
 07/29/2023   15:42:37   (  70.05, -59.60) 07/29/2023   15:43:33  (  70.03, -59.55)    3.16                56
 07/29/2023   16:33:18   ( -69.91, 107.93) 07/29/2023   16:33:03  ( -69.92, 107.92)    1.36                15
 07/29/2023   17:23:50   (  69.16, -83.67) 07/29/2023   17:22:41  (  69.21, -85.39)   68.23                69
 08/01/2023   07:59:28   (  69.99,  56.28) 08/01/2023   08:00:04  (  70.00,  56.28)    1.09                36
 08/01/2023   08:50:10   ( -69.90,-136.26) 08/01/2023   08:49:34  ( -69.89,-136.24)    1.11                36
 08/03/2023   23:25:49   ( -70.77,   3.51) 08/03/2023   23:26:57  ( -70.66,   5.47)   73.11                68
 08/04/2023   00:16:19   (  69.93, 172.14) 08/04/2023   00:16:35  (  69.95, 172.08)    2.62                16
 08/04/2023   01:07:01   ( -69.84, -20.40) 08/04/2023   01:06:05  ( -69.84, -20.43)    1.40                56
 08/06/2023   15:42:26   ( -70.04, 120.46) 08/06/2023   15:43:37  ( -70.04, 120.45)    0.28                71
 08/06/2023   16:33:10   (  69.94, -72.08) 08/06/2023   16:33:04  (  69.92, -72.07)    1.64                 6
 08/06/2023   17:23:49   ( -69.68,  95.62) 08/06/2023   17:22:36  ( -69.71,  95.27)   13.78                73
 08/09/2023   07:59:17   ( -69.99,-123.70) 08/09/2023   08:00:07  ( -69.99,-123.73)    1.24                50
 08/09/2023   08:50:01   (  69.89,  43.76) 08/09/2023   08:49:34  (  69.88,  43.75)    1.97                27