Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 26.  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)
 05/26/2023   14:52:23   ( -70.16, 132.89) 05/26/2023   14:53:35  ( -70.13, 132.95)    3.64                72
 05/26/2023   15:43:07   (  70.03, -59.61) 05/26/2023   15:43:02  (  70.03, -59.55)    2.20                 5
 05/26/2023   16:33:46   ( -69.79, 108.07) 05/26/2023   16:32:33  ( -69.86, 107.85)   11.39                73
 05/29/2023   07:09:17   ( -70.07,-111.22) 05/29/2023   07:10:05  ( -70.09,-111.22)    1.67                48
 05/29/2023   08:00:02   (  70.01,  56.20) 05/29/2023   07:59:32  (  69.99,  56.27)    3.65                30
 05/31/2023   22:35:45   (  70.93,-164.13) 05/31/2023   22:36:52  (  70.85,-161.85)   83.77                67
 05/31/2023   23:26:12   ( -70.05,   4.58) 05/31/2023   23:26:35  ( -70.03,   4.57)    2.95                23
 06/01/2023   00:16:56   (  69.94, 172.07) 06/01/2023   00:16:02  (  69.92, 172.07)    1.76                54
 06/03/2023   14:52:25   (  70.13, -47.09) 06/03/2023   14:53:34  (  70.10, -47.06)    3.30                69
 06/03/2023   15:43:06   ( -69.99, 120.45) 06/03/2023   15:43:04  ( -70.00, 120.42)    1.55                 2
 06/03/2023   16:33:46   (  69.66, -71.76) 06/03/2023   16:32:34  (  69.72, -72.32)   22.76                72
 06/06/2023   07:09:18   (  70.08,  68.76) 06/06/2023   07:10:02  (  70.05,  68.75)    3.10                44
 06/06/2023   07:59:59   ( -69.93,-123.70) 06/06/2023   07:59:32  ( -69.95,-123.76)    3.10                27
 06/08/2023   22:35:43   ( -70.92,  15.87) 06/08/2023   22:36:50  ( -70.85,  18.19)   84.70                67
 06/08/2023   23:26:12   (  70.03,-175.40) 06/08/2023   23:26:30  (  70.03,-175.39)    0.57                18
 06/09/2023   00:16:54   ( -69.93,  -7.94) 06/09/2023   00:16:00  ( -69.93,  -7.90)    1.52                54