Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/18/2021   22:33:22   (   0.03,-137.18) (  -0.02,-137.51)   37.68                80
 04/19/2021   22:14:36   (   0.03,-137.17) (   0.97,-132.98)  478.08                80
 04/21/2021   10:39:03   (  -0.02,-137.15) (   0.23,-138.23)  123.48                80
 04/22/2021   10:17:38   (  -0.02,-137.14) (  -0.82,-133.71)  391.82                80
 04/23/2021   22:39:34   (   0.02,-137.12) (  -0.39,-139.00)  214.70                80
 04/24/2021   22:23:28   (   0.02,-137.10) (   0.60,-134.47)  300.30                80
 04/26/2021   10:45:14   (  -0.02,-137.08) (   0.60,-139.72)  302.35                80
 04/27/2021   10:23:50   (  -0.02,-137.06) (  -0.45,-135.20)  212.10                80
 04/28/2021   22:45:45   (   0.02,-137.02) (  -0.75,-140.49)  395.97                80
 04/29/2021   22:29:40   (   0.02,-136.99) (   0.24,-135.96)  118.00                80
 05/01/2021   10:51:26   (  -0.01,-136.96) (   0.96,-141.22)  486.11                80