Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 1 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/21/2021   10:24:14   (  -0.03,-137.22) (  -0.47,-135.30)  219.63                80
 01/22/2021   22:46:10   (   0.02,-137.22) (  -0.73,-140.60)  385.20                80
 01/23/2021   22:30:05   (   0.01,-137.22) (   0.29,-136.07)  130.96                80
 01/25/2021   10:51:53   (   0.02,-137.20) (   0.91,-141.34)  470.51                80
 01/26/2021   10:30:27   (   0.01,-137.19) (  -0.05,-136.79)   44.71                80
 01/28/2021   22:33:39   (  -0.01,-137.16) (  -0.11,-137.57)   47.28                80
 01/29/2021   22:17:35   (  -0.01,-137.14) (   0.91,-133.04)  467.45                80
 01/31/2021   10:39:22   (   0.01,-137.12) (   0.30,-138.31)  136.05                80
 02/01/2021   10:17:58   (   0.01,-137.10) (  -0.72,-133.78)  378.34                80
 02/02/2021   22:39:54   (  -0.01,-137.07) (  -0.45,-139.08)  229.45                80
 02/03/2021   22:23:49   (  -0.00,-137.05) (   0.58,-134.56)  284.63                80