Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 8 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/11/2021   10:40:14   (   0.04,-137.20) (   0.32,-138.41)  138.54                80
 08/12/2021   10:18:51   (   0.04,-137.19) (  -0.73,-133.89)  377.38                80
 08/13/2021   22:40:48   (  -0.04,-137.19) (  -0.47,-139.19)  228.03                80
 08/14/2021   22:24:44   (  -0.04,-137.18) (   0.52,-134.66)  287.41                80
 08/16/2021   10:46:32   (   0.04,-137.16) (   0.67,-139.93)  315.19                80
 08/17/2021   10:25:08   (   0.03,-137.15) (  -0.38,-135.41)  199.56                80
 08/18/2021   22:47:06   (  -0.02,-137.13) (  -0.80,-140.71)  407.80                80
 08/19/2021   22:31:01   (  -0.00,-137.11) (   0.19,-136.18)  106.23                80
 08/21/2021   10:50:11   (  -0.01,-137.09) (   0.94,-141.46)  497.61                80
 08/22/2021   10:34:06   (  -0.01,-137.07) (  -0.05,-136.92)   16.84                80