Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 13.  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)
 07/16/2023   07:09:11   ( -70.69,-112.17) 07/16/2023   07:10:20  ( -70.58,-110.51)   62.25                69
 07/16/2023   07:59:44   (  70.00,  56.21) 07/16/2023   07:59:56  (  69.99,  56.27)    2.61                12
 07/16/2023   08:50:25   ( -69.85,-136.25) 07/16/2023   08:49:26  ( -69.87,-136.25)    2.31                59
 07/18/2023   23:25:52   ( -70.06,   4.60) 07/18/2023   23:26:58  ( -70.08,   4.64)    3.32                66
 07/19/2023   00:16:36   (  69.95, 172.07) 07/19/2023   00:16:26  (  69.92, 172.06)    3.43                10
 07/19/2023   01:07:12   ( -69.54, -20.00) 07/19/2023   01:06:00  ( -69.59, -20.76)   29.95                72
 07/21/2023   15:42:43   ( -70.01, 120.45) 07/21/2023   15:43:27  ( -70.00, 120.41)    1.97                44
 07/21/2023   16:33:27   (  69.91, -72.09) 07/21/2023   16:32:54  (  69.89, -72.10)    2.41                33
 07/24/2023   07:09:07   (  70.81,  67.64) 07/24/2023   07:10:14  (  70.70,  69.71)   76.62                67
 07/24/2023   07:59:35   ( -69.97,-123.72) 07/24/2023   07:59:55  ( -70.00,-123.70)    3.26                20
 07/24/2023   08:50:19   (  69.87,  43.74) 07/24/2023   08:49:22  (  69.88,  43.79)    2.38                57
 07/26/2023   23:25:45   (  70.04,-175.37) 07/26/2023   23:26:54  (  70.02,-175.40)    2.57                69
 07/27/2023   00:16:27   ( -69.94,  -7.89) 07/27/2023   00:16:24  ( -69.92,  -7.91)    1.81                 3
 07/27/2023   01:07:06   (  69.58, 159.95) 07/27/2023   01:05:54  (  69.64, 159.34)   24.76                72