Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 4 29.  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)
 04/29/2023   20:32:02   (  -0.02,-104.73) (  -0.59,-107.23)  284.58                80
 04/30/2023   20:15:59   (  -0.02,-104.73) (   0.45,-102.70)  231.62                80
 05/02/2023   08:37:47   (   0.02,-104.74) (   0.76,-107.97)  369.52                80
 05/03/2023   08:16:24   (   0.01,-104.74) (  -0.28,-103.45)  146.33                80
 05/04/2023   20:38:21   (   0.00,-104.73) (  -0.91,-108.76)  459.58                80
 05/05/2023   20:22:18   (   0.01,-104.73) (   0.14,-104.24)   56.35                80
 05/08/2023   08:25:21   (  -0.01,-104.73) (   0.07,-104.98)   29.61                80
 05/09/2023   08:03:58   (  -0.01,-104.72) (  -0.98,-100.46)  485.96                80
 05/10/2023   20:25:54   (   0.01,-104.71) (  -0.26,-105.76)  120.70                80
 05/11/2023   20:09:51   (   0.00,-104.71) (   0.80,-101.24)  395.09                80
 05/13/2023   08:31:39   (  -0.01,-104.71) (   0.39,-106.52)  206.03                80