Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 7 19.  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)
 07/19/2023   20:15:48   (  -0.01,-104.71) (   0.42,-102.77)  221.50                80
 07/21/2023   08:37:35   (   0.01,-104.72) (   0.76,-108.03)  376.98                80
 07/22/2023   08:16:09   (   0.01,-104.72) (  -0.25,-103.50)  139.60                80
 07/23/2023   20:38:04   (  -0.02,-104.71) (  -0.91,-108.80)  466.15                80
 07/24/2023   20:21:58   (  -0.02,-104.71) (   0.05,-104.26)   50.86                80
 07/27/2023   08:24:59   (   0.02,-104.72) (   0.10,-104.99)   30.86                80
 07/28/2023   08:03:33   (   0.02,-104.72) (  -0.92,-100.46)  485.51                80
 07/29/2023   20:25:28   (  -0.03,-104.69) (  -0.28,-105.75)  121.10                80
 07/30/2023   20:09:22   (  -0.03,-104.69) (   0.74,-101.22)  395.27                80
 08/01/2023   08:31:08   (   0.04,-104.70) (   0.43,-106.49)  203.23                80
 08/02/2023   08:09:43   (   0.04,-104.70) (  -0.60,-101.96)  312.87                80