Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 15.  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)
 06/16/2023   23:26:09   ( -70.02,   4.62) 06/16/2023   23:26:44  ( -70.02,   4.56)    2.27                35
 06/17/2023   00:16:53   (  69.90, 172.10) 06/17/2023   00:16:11  (  69.92, 172.06)    2.64                42
 06/19/2023   14:52:29   (  70.51, -47.69) 06/19/2023   14:53:39  (  70.38, -46.67)   40.13                70
 06/19/2023   15:43:03   ( -69.99, 120.43) 06/19/2023   15:43:14  ( -70.00, 120.40)    1.07                11
 06/19/2023   16:33:47   (  69.88, -72.09) 06/19/2023   16:32:41  (  69.89, -72.10)    1.44                66
 06/22/2023   07:09:15   (  70.07,  68.77) 06/22/2023   07:10:14  (  70.06,  68.74)    1.54                59
 06/22/2023   07:59:57   ( -69.97,-123.77) 06/22/2023   07:59:44  ( -69.95,-123.78)    2.43                13
 06/22/2023   08:50:30   (  69.28,  44.55) 06/22/2023   08:49:21  (  69.29,  42.97)   62.43                69
 06/24/2023   23:26:09   (  70.05,-175.44) 06/24/2023   23:26:43  (  70.04,-175.40)    2.29                34
 06/25/2023   00:16:51   ( -69.95,  -7.97) 06/25/2023   00:16:13  ( -69.93,  -7.91)    3.16                38
 06/27/2023   14:52:28   ( -70.62, 132.13) 06/27/2023   14:53:38  ( -70.50, 133.51)   52.82                70
 06/27/2023   15:43:01   (  69.99, -59.58) 06/27/2023   15:43:11  (  70.00, -59.56)    1.17                10
 06/27/2023   16:33:43   ( -69.89, 107.89) 06/27/2023   16:32:41  ( -69.90, 107.93)    1.65                62