Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 7.  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)
 04/07/2023   07:35:03   (  70.07,  62.44) 04/07/2023   07:35:25  (  70.07,  62.47)    0.98                22
 04/07/2023   08:25:44   ( -69.94,-130.03) 04/07/2023   08:24:55  ( -69.95,-130.06)    2.32                49
 04/09/2023   23:01:13   ( -70.35,  10.49) 04/09/2023   23:02:24  ( -70.26,  10.97)   20.59                71
 04/09/2023   23:51:53   (  70.03, 178.30) 04/09/2023   23:51:53  (  70.04, 178.31)    2.00                 0
 04/10/2023   00:42:35   ( -69.94, -14.25) 04/10/2023   00:41:23  ( -69.93, -14.21)    1.71                72
 04/12/2023   15:17:59   ( -70.10, 126.66) 04/12/2023   15:18:54  ( -70.09, 126.62)    2.04                55
 04/12/2023   16:08:43   (  69.99, -65.86) 04/12/2023   16:08:21  (  69.98, -65.89)    1.40                22
 04/12/2023   16:59:11   ( -69.16, 102.66) 04/12/2023   16:58:03  ( -69.21, 100.70)   77.85                68
 04/15/2023   07:34:48   ( -70.07,-117.51) 04/15/2023   07:35:20  ( -70.06,-117.55)    2.37                32
 04/15/2023   08:25:32   (  69.96,  49.96) 04/15/2023   08:24:47  (  69.94,  49.94)    2.43                45
 04/17/2023   23:01:02   (  70.46,-169.65) 04/17/2023   23:02:12  (  70.37,-168.85)   31.75                70
 04/17/2023   23:51:38   ( -70.05,  -1.69) 04/17/2023   23:51:46  ( -70.04,  -1.68)    1.44                 8
 04/18/2023   00:42:22   (  69.95, 165.77) 04/18/2023   00:41:13  (  69.92, 165.80)    2.75                69
 04/20/2023   15:17:45   (  70.09, -53.28) 04/20/2023   15:18:42  (  70.09, -53.35)    2.72                57
 04/20/2023   16:08:27   ( -69.99, 114.18) 04/20/2023   16:08:12  ( -69.99, 114.14)    1.89                15
 04/20/2023   16:58:58   (  69.20, -77.35) 04/20/2023   16:57:50  (  69.26, -79.20)   73.33                68