Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 8 20.  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)
 08/22/2023   15:42:27   ( -70.61, 119.59) 08/22/2023   15:43:36  ( -70.47, 121.07)   56.92                69
 08/22/2023   16:33:01   (  69.96, -72.09) 08/22/2023   16:33:11  (  69.93, -72.06)    3.31                10
 08/22/2023   17:23:42   ( -69.82,  95.43) 08/22/2023   17:22:41  ( -69.82,  95.42)    0.59                61
 08/25/2023   07:59:13   ( -70.03,-123.75) 08/25/2023   08:00:14  ( -70.02,-123.70)    2.11                61
 08/25/2023   08:49:57   (  69.91,  43.74) 08/25/2023   08:49:41  (  69.91,  43.79)    2.10                16
 08/25/2023   09:40:29   ( -69.29,-148.05) 08/25/2023   09:39:19  ( -69.37,-149.32)   50.71                70
 08/28/2023   00:16:09   ( -69.99,  -7.93) 08/28/2023   00:16:44  ( -69.98,  -7.87)    2.07                35
 08/28/2023   01:06:53   (  69.87, 159.56) 08/28/2023   01:06:11  (  69.87, 159.62)    2.13                42
 08/30/2023   15:42:29   (  70.36, -60.06) 08/30/2023   15:43:40  (  70.24, -59.26)   33.11                71
 08/30/2023   16:33:04   ( -69.90, 107.97) 08/30/2023   16:33:14  ( -69.92, 107.92)    2.58                10
 08/30/2023   17:23:48   (  69.78, -84.55) 08/30/2023   17:22:41  (  69.80, -84.59)    2.63                67
 09/02/2023   07:59:17   (  69.97,  56.31) 09/02/2023   08:00:12  (  69.98,  56.26)    2.30                55
 09/02/2023   08:49:59   ( -69.87,-136.23) 09/02/2023   08:49:42  ( -69.88,-136.25)    0.86                17
 09/02/2023   09:40:29   (  69.01,  32.31) 09/02/2023   09:39:21  (  69.10,  30.35)   78.43                68