Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 1 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/07/2021   22:30:05   (   0.02,-137.23) (   0.31,-136.06)  133.59                80
 01/09/2021   10:51:52   (  -0.01,-137.23) (   0.90,-141.33)  466.91                80
 01/10/2021   10:33:07   (   0.00,-137.23) (  -0.12,-136.80)   49.61                80
 01/12/2021   22:33:39   (  -0.02,-137.22) (  -0.07,-137.57)   39.59                80
 01/13/2021   22:17:35   (  -0.01,-137.21) (   0.95,-133.04)  476.22                80
 01/15/2021   10:39:22   (   0.01,-137.20) (   0.26,-138.30)  125.59                80
 01/16/2021   10:17:58   (   0.01,-137.19) (  -0.75,-133.77)  389.97                80
 01/17/2021   22:39:54   (  -0.01,-137.18) (  -0.44,-139.08)  215.78                80
 01/18/2021   22:23:49   (  -0.01,-137.18) (   0.58,-134.55)  299.68                80
 01/20/2021   10:45:38   (   0.01,-137.16) (   0.58,-139.82)  302.55                80