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)
 07/16/2023   07:09:11   ( -70.67,-112.15) 07/16/2023   07:10:20  ( -70.59,-110.49)   61.72                69
 07/16/2023   07:59:44   (  69.99,  56.24) 07/16/2023   07:59:56  (  70.00,  56.29)    2.89                12
 07/16/2023   08:50:26   ( -69.89,-136.31) 07/16/2023   08:49:26  ( -69.89,-136.24)    2.75                60
 07/18/2023   23:25:51   ( -70.04,   4.62) 07/18/2023   23:26:58  ( -70.04,   4.58)    1.42                67
 07/19/2023   00:16:35   (  69.94, 172.09) 07/19/2023   00:16:25  (  69.94, 172.08)    0.30                10
 07/19/2023   01:07:11   ( -69.52, -19.98) 07/19/2023   01:05:59  ( -69.60, -20.74)   30.75                72
 07/21/2023   15:42:43   ( -70.00, 120.47) 07/21/2023   15:43:27  ( -70.01, 120.43)    2.00                44
 07/21/2023   16:33:27   (  69.89, -72.07) 07/21/2023   16:32:54  (  69.90, -72.08)    1.05                33
 07/24/2023   07:09:07   (  70.79,  67.67) 07/24/2023   07:10:14  (  70.72,  69.72)   75.74                67
 07/24/2023   07:59:35   ( -69.96,-123.69) 07/24/2023   07:59:56  ( -69.95,-123.76)    2.68                21
 07/24/2023   08:50:19   (  69.85,  43.77) 07/24/2023   08:49:23  (  69.84,  43.73)    2.21                56
 07/26/2023   23:25:45   (  70.03,-175.34) 07/26/2023   23:26:54  (  70.03,-175.39)    2.19                69
 07/27/2023   00:16:27   ( -69.92,  -7.87) 07/27/2023   00:16:24  ( -69.93,  -7.91)    1.70                 3
 07/27/2023   01:07:06   (  69.56, 159.98) 07/27/2023   01:05:54  (  69.65, 159.35)   26.40                72
 07/29/2023   15:42:36   (  70.00, -59.52) 07/29/2023   15:43:21  (  69.98, -59.57)    2.97                45
 07/29/2023   16:33:18   ( -69.89, 107.95) 07/29/2023   16:32:51  ( -69.88, 107.92)    2.14                27