Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 28.  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)
 05/29/2023   07:09:18   ( -70.10,-111.25) 05/29/2023   07:10:05  ( -70.12,-111.18)    3.32                47
 05/29/2023   08:00:02   (  69.97,  56.24) 05/29/2023   07:59:33  (  69.96,  56.24)    1.52                29
 05/31/2023   22:35:45   (  70.95,-164.16) 05/31/2023   22:36:52  (  70.83,-161.88)   84.31                67
 05/31/2023   23:26:12   ( -70.07,   4.55) 05/31/2023   23:26:34  ( -70.06,   4.62)    3.07                22
 06/01/2023   00:16:56   (  69.95, 172.04) 06/01/2023   00:16:01  (  69.95, 172.12)    2.83                55
 06/03/2023   14:52:24   (  70.09, -47.03) 06/03/2023   14:53:34  (  70.09, -47.08)    2.15                70
 06/03/2023   15:43:06   ( -70.00, 120.43) 06/03/2023   15:43:04  ( -69.98, 120.40)    2.35                 2
 06/03/2023   16:33:46   (  69.67, -71.77) 06/03/2023   16:32:34  (  69.71, -72.34)   22.18                72
 06/06/2023   07:09:19   (  70.08,  68.76) 06/06/2023   07:10:02  (  70.10,  68.82)    3.53                43
 06/06/2023   08:00:00   ( -69.93,-123.71) 06/06/2023   07:59:33  ( -69.94,-123.77)    2.66                27
 06/08/2023   22:35:45   ( -70.97,  15.79) 06/08/2023   22:36:51  ( -70.86,  18.19)   88.15                66
 06/08/2023   23:26:13   (  70.02,-175.39) 06/08/2023   23:26:31  (  70.04,-175.38)    2.03                18
 06/09/2023   00:16:55   ( -69.93,  -7.93) 06/09/2023   00:16:01  ( -69.94,  -7.89)    1.82                54