Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 3.  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)
 04/03/2023   07:09:48   (  70.14,  68.67) 04/03/2023   07:10:29  (  70.12,  68.70)    2.30                41
 04/03/2023   08:00:29   ( -70.00,-123.80) 04/03/2023   07:59:59  ( -70.00,-123.83)    1.21                30
 04/05/2023   22:36:09   ( -70.97,  15.81) 04/05/2023   22:37:16  ( -70.87,  18.05)   82.27                67
 04/05/2023   23:26:38   (  70.08,-175.45) 04/05/2023   23:26:56  (  70.05,-175.51)    3.44                18
 04/06/2023   00:17:20   ( -69.99,  -8.00) 04/06/2023   00:16:25  ( -69.99,  -7.96)    1.59                55
 04/08/2023   14:52:45   ( -70.19, 132.85) 04/08/2023   14:53:54  ( -70.16, 132.89)    3.09                69
 04/08/2023   15:43:28   (  70.03, -59.59) 04/08/2023   15:43:21  (  70.05, -59.62)    3.29                 7
 04/08/2023   16:34:06   ( -69.72, 108.18) 04/08/2023   16:32:54  ( -69.78, 107.63)   21.87                72
 04/11/2023   07:09:34   ( -70.15,-111.30) 04/11/2023   07:10:18  ( -70.13,-111.27)    2.53                44
 04/11/2023   08:00:17   (  69.99,  56.25) 04/11/2023   07:59:45  (  70.01,  56.22)    3.17                32
 04/13/2023   22:35:54   (  70.85,-163.95) 04/13/2023   22:37:02  (  70.76,-162.07)   69.27                68
 04/13/2023   23:26:24   ( -70.12,   4.53) 04/13/2023   23:26:42  ( -70.11,   4.60)    3.10                18
 04/14/2023   00:17:07   (  69.96, 172.07) 04/14/2023   00:16:09  (  69.99, 172.08)    2.99                58
 04/16/2023   14:52:31   (  70.15, -47.05) 04/16/2023   14:53:36  (  70.15, -47.07)    0.88                65
 04/16/2023   15:43:13   ( -70.05, 120.42) 04/16/2023   15:43:06  ( -70.05, 120.41)    0.85                 7
 04/16/2023   16:33:50   (  69.58, -71.57) 04/16/2023   16:32:39  (  69.59, -72.57)   38.60                71