Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/20/2021   22:31:15   (  -0.03,-137.20) (   0.18,-136.19)  115.10                80
 09/22/2021   10:50:23   (   0.03,-137.21) (   0.99,-141.46)  484.37                80
 09/23/2021   10:34:19   (   0.03,-137.21) (  -0.01,-136.92)   32.11                80
 09/25/2021   22:34:52   (  -0.03,-137.20) (  -0.15,-137.70)   57.67                80
 09/26/2021   22:18:47   (  -0.03,-137.19) (   0.86,-133.17)  458.08                80
 09/28/2021   10:37:56   (   0.02,-137.18) (   0.31,-138.44)  143.10                80
 09/29/2021   10:21:51   (   0.02,-137.17) (  -0.69,-133.91)  372.09                80
 09/30/2021   22:41:08   (  -0.01,-137.15) (  -0.46,-139.22)  235.46                80
 10/01/2021   22:25:04   (  -0.01,-137.13) (   0.54,-134.68)  279.38                80
 10/03/2021   10:44:12   (   0.00,-137.12) (   0.63,-139.95)  322.95                80