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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/18/2021   22:23:50   (   0.00,-137.21) (   0.61,-134.55)  303.47                80
 01/20/2021   10:45:37   (  -0.01,-137.21) (   0.60,-139.82)  297.37                80
 01/21/2021   10:24:13   (  -0.01,-137.21) (  -0.42,-135.29)  218.69                80
 01/22/2021   22:46:09   (   0.01,-137.20) (  -0.77,-140.59)  386.64                80
 01/23/2021   22:30:05   (   0.01,-137.20) (   0.25,-136.06)  129.00                80
 01/25/2021   10:51:53   (  -0.02,-137.18) (   0.90,-141.34)  473.22                80
 01/26/2021   10:30:28   (  -0.02,-137.17) (  -0.12,-136.81)   41.84                80
 01/28/2021   22:33:39   (   0.02,-137.14) (  -0.10,-137.57)   50.47                80
 01/29/2021   22:17:35   (   0.02,-137.12) (   0.93,-133.05)  464.21                80
 01/31/2021   10:39:23   (  -0.02,-137.09) (   0.22,-138.32)  139.33                80