Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 15.  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)
 05/17/2023   07:34:37   ( -70.06,-117.51) 05/17/2023   07:35:06  ( -70.06,-117.58)    2.39                29
 05/17/2023   08:25:21   (  69.94,  49.98) 05/17/2023   08:24:33  (  69.96,  49.92)    3.17                48
 05/19/2023   23:00:52   (  70.20,-169.27) 05/19/2023   23:02:03  (  70.17,-169.17)    4.97                71
 05/19/2023   23:51:33   ( -70.06,  -1.75) 05/19/2023   23:51:33  ( -70.06,  -1.70)    1.75                 0
 05/20/2023   00:42:14   (  69.78, 165.99) 05/20/2023   00:41:02  (  69.84, 165.64)   14.82                72
 05/22/2023   15:17:45   (  70.10, -53.36) 05/22/2023   15:18:30  (  70.08, -53.42)    3.25                45
 05/22/2023   16:08:27   ( -70.01, 114.09) 05/22/2023   16:07:59  ( -70.02, 114.14)    2.23                28
 05/25/2023   06:44:10   ( -70.91,-106.20) 05/25/2023   06:45:18  ( -70.79,-104.14)   76.40                68
 05/25/2023   07:34:40   (  70.06,  62.46) 05/25/2023   07:34:56  (  70.07,  62.46)    0.95                16
 05/25/2023   08:25:22   ( -69.97,-130.08) 05/25/2023   08:24:26  ( -69.97,-130.06)    1.19                56
 05/27/2023   23:00:51   ( -70.15,  10.79) 05/27/2023   23:01:55  ( -70.15,  10.82)    1.31                64
 05/27/2023   23:51:35   (  70.03, 178.27) 05/27/2023   23:51:22  (  70.04, 178.30)    1.11                13
 05/28/2023   00:42:09   ( -69.52, -13.65) 05/28/2023   00:40:58  ( -69.60, -14.67)   40.84                71