Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 3 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/09/2021   10:45:34   (  -0.05,-137.21) (   0.55,-139.83)  298.36                80
 03/10/2021   10:24:10   (  -0.04,-137.21) (  -0.48,-135.30)  218.29                80
 03/11/2021   22:46:05   (   0.03,-137.22) (  -0.74,-140.59)  384.82                80
 03/12/2021   22:30:01   (   0.03,-137.22) (   0.30,-136.07)  131.78                80
 03/14/2021   10:51:48   (  -0.03,-137.21) (   0.89,-141.33)  469.47                80
 03/15/2021   10:30:23   (  -0.03,-137.21) (  -0.15,-136.80)   46.84                80
 03/17/2021   22:33:34   (   0.03,-137.21) (  -0.03,-137.57)   41.46                80
 03/18/2021   22:17:29   (   0.03,-137.20) (   0.95,-133.03)  474.33                80
 03/20/2021   10:39:16   (  -0.03,-137.18) (   0.24,-138.30)  128.38                80
 03/21/2021   10:17:52   (  -0.03,-137.16) (  -0.80,-133.77)  386.80                80
 03/22/2021   22:39:47   (   0.02,-137.15) (  -0.41,-139.07)  218.96                80