Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 16.  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)
 07/18/2023   23:25:52   ( -70.08,   4.56) 07/18/2023   23:26:58  ( -70.06,   4.61)    3.08                66
 07/19/2023   00:16:36   (  69.97, 172.04) 07/19/2023   00:16:25  (  69.95, 172.11)    3.40                11
 07/19/2023   01:07:11   ( -69.51, -19.96) 07/19/2023   01:06:00  ( -69.56, -20.79)   33.08                71
 07/21/2023   15:42:44   ( -70.03, 120.41) 07/21/2023   15:43:27  ( -70.02, 120.45)    1.70                43
 07/21/2023   16:33:28   (  69.93, -72.12) 07/21/2023   16:32:54  (  69.92, -72.06)    2.76                34
 07/24/2023   07:09:06   (  70.78,  67.70) 07/24/2023   07:10:14  (  70.68,  69.66)   73.04                68
 07/24/2023   07:59:35   ( -69.99,-123.75) 07/24/2023   07:59:55  ( -69.97,-123.74)    2.80                20
 07/24/2023   08:50:18   (  69.84,  43.79) 07/24/2023   08:49:22  (  69.86,  43.75)    2.68                56
 07/26/2023   23:25:45   (  70.06,-175.39) 07/26/2023   23:26:53  (  70.05,-175.37)    1.96                68
 07/27/2023   00:16:27   ( -69.96,  -7.92) 07/27/2023   00:16:23  ( -69.94,  -7.89)    2.20                 4
 07/27/2023   01:07:06   (  69.59, 159.93) 07/27/2023   01:05:54  (  69.61, 159.30)   24.57                72
 07/29/2023   15:42:36   (  69.98, -59.50) 07/29/2023   15:43:21  (  69.99, -59.55)    2.43                45
 07/29/2023   16:33:18   ( -69.88, 107.98) 07/29/2023   16:32:51  ( -69.89, 107.94)    2.32                27