Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 4 9.  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)
 04/09/2023   20:10:13   (  -0.00,-104.75) (   0.77,-101.27)  395.77                80
 04/11/2023   08:31:58   (  -0.00,-104.73) (   0.40,-106.54)  205.88                80
 04/12/2023   08:10:32   (  -0.00,-104.72) (  -0.60,-102.00)  310.33                80
 04/13/2023   20:32:26   (  -0.00,-104.72) (  -0.55,-107.30)  293.28                80
 04/14/2023   20:16:20   (  -0.00,-104.72) (   0.45,-102.76)  223.36                80
 04/16/2023   08:38:05   (   0.00,-104.71) (   0.71,-108.03)  377.53                80
 04/17/2023   08:16:39   (   0.00,-104.70) (  -0.30,-103.49)  139.11                80
 04/18/2023   20:38:32   (  -0.00,-104.71) (  -0.90,-108.78)  464.27                80
 04/19/2023   20:22:25   (   0.00,-104.71) (   0.11,-104.25)   52.80                80
 04/22/2023   08:25:24   (  -0.01,-104.70) (   0.03,-104.97)   30.73                80