Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/05/2021   22:36:24   (  -0.01,-137.18) (  -0.08,-137.56)   42.68                80
 06/06/2021   22:15:00   (   0.00,-137.18) (   0.96,-133.04)  472.85                80
 06/08/2021   10:39:29   (   0.00,-137.17) (   0.25,-138.30)  129.30                80
 06/09/2021   10:18:04   (  -0.00,-137.16) (  -0.74,-133.77)  385.64                80
 06/10/2021   22:40:01   (   0.00,-137.14) (  -0.45,-139.07)  221.17                80
 06/11/2021   22:23:58   (   0.01,-137.12) (   0.60,-134.55)  293.41                80
 06/13/2021   10:45:46   (  -0.01,-137.10) (   0.61,-139.82)  310.15                80
 06/14/2021   10:24:23   (  -0.01,-137.08) (  -0.43,-135.29)  204.00                80
 06/15/2021   22:46:19   (   0.01,-137.05) (  -0.81,-140.59)  404.08                80
 06/16/2021   22:30:16   (   0.01,-137.03) (   0.24,-136.07)  109.89                80