Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 4.  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)
 05/05/2023   07:09:12   (  70.14,  68.75) 05/05/2023   07:10:10  (  70.14,  68.70)    1.74                58
 05/05/2023   07:59:54   ( -70.06,-123.81) 05/05/2023   07:59:39  ( -70.08,-123.75)    3.11                15
 05/05/2023   08:50:26   (  69.30,  44.62) 05/05/2023   08:49:17  (  69.37,  42.92)   67.07                69
 05/07/2023   23:26:08   (  70.10,-175.43) 05/07/2023   23:26:37  (  70.11,-175.45)    1.95                29
 05/08/2023   00:16:50   ( -70.01,  -7.98) 05/08/2023   00:16:07  ( -70.00,  -7.98)    1.36                43
 05/10/2023   14:52:22   ( -70.34, 132.65) 05/10/2023   14:53:34  ( -70.28, 133.03)   15.45                72
 05/10/2023   15:43:03   (  70.06, -59.61) 05/10/2023   15:43:03  (  70.06, -59.64)    1.14                 0
 05/10/2023   16:33:45   ( -69.98, 107.84) 05/10/2023   16:32:33  ( -69.96, 107.84)    2.29                72
 05/13/2023   07:09:15   ( -70.15,-111.29) 05/13/2023   07:10:02  ( -70.16,-111.27)    1.28                47
 05/13/2023   07:59:59   (  70.04,  56.19) 05/13/2023   07:59:29  (  70.05,  56.22)    1.44                30
 05/15/2023   22:35:41   (  70.85,-163.97) 05/15/2023   22:36:49  (  70.72,-162.19)   66.73                68
 05/15/2023   23:26:11   ( -70.13,   4.50) 05/15/2023   23:26:28  ( -70.12,   4.56)    2.51                17
 05/16/2023   00:16:55   (  70.01, 171.99) 05/16/2023   00:15:55  (  70.00, 172.04)    2.61                60