Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 8.  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)
 05/10/2023   14:52:22   ( -70.34, 132.66) 05/10/2023   14:53:34  ( -70.27, 133.01)   15.06                72
 05/10/2023   15:43:03   (  70.05, -59.60) 05/10/2023   15:43:03  (  70.05, -59.65)    2.16                 0
 05/10/2023   16:33:45   ( -69.97, 107.85) 05/10/2023   16:32:32  ( -70.00, 107.90)    3.31                73
 05/13/2023   07:09:15   ( -70.15,-111.30) 05/13/2023   07:10:01  ( -70.17,-111.24)    2.87                46
 05/13/2023   07:59:59   (  70.03,  56.20) 05/13/2023   07:59:29  (  70.01,  56.17)    2.88                30
 05/15/2023   22:35:40   (  70.81,-163.89) 05/15/2023   22:36:48  (  70.70,-162.21)   62.73                68
 05/15/2023   23:26:10   ( -70.09,   4.57) 05/15/2023   23:26:27  ( -70.10,   4.54)    1.44                17
 05/16/2023   00:16:54   (  69.97, 172.06) 05/16/2023   00:15:54  (  69.98, 172.02)    2.05                60
 05/18/2023   14:52:23   (  70.18, -47.12) 05/18/2023   14:53:21  (  70.15, -47.13)    2.96                58
 05/18/2023   15:43:04   ( -70.03, 120.42) 05/18/2023   15:42:51  ( -70.04, 120.35)    2.63                13
 05/18/2023   16:33:37   (  69.33, -71.25) 05/18/2023   16:32:28  (  69.37, -72.91)   65.52                69
 05/21/2023   07:09:18   (  70.13,  68.71) 05/21/2023   07:09:45  (  70.11,  68.72)    2.09                27
 05/21/2023   07:59:59   ( -69.99,-123.75) 05/21/2023   07:59:15  ( -70.01,-123.80)    3.15                44