Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 25.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 07/25/2023   15:17:22   (  70.21, -53.52) 07/25/2023   15:18:34  (  70.14, -53.19)   14.76                72
 07/25/2023   16:08:01   ( -69.97, 114.18) 07/25/2023   16:08:05  ( -69.97, 114.20)    0.89                 4
 07/25/2023   16:58:45   (  69.85, -78.34) 07/25/2023   16:57:32  (  69.88, -78.28)    3.36                73
 07/28/2023   07:34:11   (  70.03,  62.54) 07/28/2023   07:35:08  (  70.05,  62.55)    1.84                57
 07/28/2023   08:24:53   ( -69.94,-130.00) 07/28/2023   08:24:38  ( -69.93,-129.98)    1.03                15
 07/28/2023   09:15:25   (  69.19,  38.39) 07/28/2023   09:14:16  (  69.23,  36.71)   66.51                69
 07/30/2023   23:51:02   (  70.02, 178.34) 07/30/2023   23:51:39  (  70.04, 178.41)    3.58                37
 07/31/2023   00:41:43   ( -69.87, -14.11) 07/31/2023   00:41:10  ( -69.87, -14.19)    2.91                33
 08/02/2023   15:17:25   ( -70.90, 125.42) 08/02/2023   15:18:32  ( -70.76, 127.71)   84.97                67
 08/02/2023   16:07:53   (  69.96, -65.78) 08/02/2023   16:08:12  (  69.95, -65.84)    2.32                19
 08/02/2023   16:58:35   ( -69.86, 101.68) 08/02/2023   16:57:42  ( -69.84, 101.64)    2.40                53
 08/05/2023   07:34:03   ( -70.16,-117.62) 08/05/2023   07:35:15  ( -70.10,-117.39)   10.86                72
 08/05/2023   08:24:45   (  69.95,  50.00) 08/05/2023   08:24:43  (  69.94,  50.03)    1.73                 2
 08/05/2023   09:15:26   ( -69.80,-142.45) 08/05/2023   09:14:13  ( -69.84,-142.49)    4.15                73
 08/07/2023   23:50:52   ( -70.01,  -1.61) 08/07/2023   23:51:47  ( -70.02,  -1.63)    1.71                55
 08/08/2023   00:41:36   (  69.91, 165.85) 08/08/2023   00:41:14  (  69.91, 165.86)    0.47                22