Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 8 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 08/13/2023   08:03:14   (   0.00,-104.71) (  -0.96,-100.40)  491.41                80
 08/14/2023   20:25:08   (  -0.01,-104.70) (  -0.21,-105.70)  113.95                80
 08/15/2023   20:09:02   (  -0.01,-104.70) (   0.77,-101.16)  403.13                80
 08/17/2023   08:30:48   (   0.01,-104.72) (   0.37,-106.43)  194.66                80
 08/18/2023   08:09:22   (   0.01,-104.72) (  -0.62,-101.89)  322.28                80
 08/19/2023   20:31:16   (  -0.01,-104.70) (  -0.54,-107.19)  283.09                80
 08/20/2023   20:15:10   (  -0.01,-104.70) (   0.45,-102.65)  234.17                80
 08/22/2023   08:36:55   (   0.01,-104.73) (   0.74,-107.91)  363.04                80
 08/23/2023   08:15:29   (   0.01,-104.73) (  -0.31,-103.38)  153.76                80
 08/24/2023   20:37:23   (  -0.01,-104.70) (  -0.91,-108.67)  452.55                80
 08/25/2023   20:21:16   (  -0.01,-104.70) (   0.09,-104.13)   64.27                80