Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 3 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/12/2021   22:30:01   (   0.04,-137.22) (   0.32,-136.07)  131.00                80
 03/14/2021   10:51:48   (  -0.04,-137.21) (   0.86,-141.34)  470.36                80
 03/15/2021   10:30:23   (  -0.04,-137.20) (  -0.12,-136.80)   45.76                80
 03/17/2021   22:33:34   (   0.04,-137.19) (  -0.07,-137.56)   43.00                80
 03/18/2021   22:17:29   (   0.04,-137.18) (   0.97,-133.04)  472.65                80
 03/20/2021   10:39:16   (  -0.04,-137.16) (   0.21,-138.30)  130.13                80
 03/21/2021   10:17:51   (  -0.04,-137.15) (  -0.77,-133.76)  384.92                80
 03/22/2021   22:39:47   (   0.03,-137.13) (  -0.39,-139.07)  221.24                80
 03/23/2021   22:23:42   (   0.02,-137.11) (   0.59,-134.53)  293.48                80
 03/25/2021   10:45:29   (  -0.01,-137.07) (   0.59,-139.80)  310.42                80