Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 12.  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)
 06/14/2023   07:09:16   ( -70.07,-111.24) 06/14/2023   07:10:14  ( -70.06,-111.27)    2.17                58
 06/14/2023   08:00:00   (  69.96,  56.25) 06/14/2023   07:59:41  (  69.96,  56.23)    0.80                19
 06/14/2023   08:50:30   ( -69.23,-135.38) 06/14/2023   08:49:21  ( -69.30,-137.04)   65.59                69
 06/16/2023   23:26:10   ( -70.04,   4.58) 06/16/2023   23:26:44  ( -70.05,   4.60)    0.88                34
 06/17/2023   00:16:54   (  69.93, 172.06) 06/17/2023   00:16:11  (  69.94, 172.09)    2.10                43
 06/19/2023   14:52:29   (  70.48, -47.65) 06/19/2023   14:53:39  (  70.40, -46.65)   38.33                70
 06/19/2023   15:43:04   ( -70.02, 120.39) 06/19/2023   15:43:14  ( -70.01, 120.43)    1.59                10
 06/19/2023   16:33:48   (  69.91, -72.14) 06/19/2023   16:32:41  (  69.91, -72.08)    2.25                67
 06/22/2023   07:09:14   (  70.05,  68.80) 06/22/2023   07:10:13  (  70.06,  68.75)    2.42                59
 06/22/2023   07:59:56   ( -69.95,-123.73) 06/22/2023   07:59:43  ( -69.95,-123.77)    1.49                13
 06/22/2023   08:50:29   (  69.26,  44.58) 06/22/2023   08:49:20  (  69.29,  42.97)   63.43                69
 06/24/2023   23:26:08   (  70.04,-175.42) 06/24/2023   23:26:42  (  70.03,-175.41)    1.67                34
 06/25/2023   00:16:50   ( -69.94,  -7.95) 06/25/2023   00:16:12  ( -69.92,  -7.92)    1.88                38