Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/29/2021   10:21:51   (   0.04,-137.20) (  -0.69,-133.90)  375.74                80
 09/30/2021   22:41:08   (  -0.03,-137.19) (  -0.47,-139.21)  229.73                80
 10/01/2021   22:25:04   (  -0.03,-137.18) (   0.54,-134.68)  285.69                80
 10/03/2021   10:44:12   (   0.02,-137.16) (   0.63,-139.95)  317.00                80
 10/04/2021   10:28:08   (   0.02,-137.15) (  -0.38,-135.42)  198.13                80
 10/05/2021   22:47:24   (  -0.02,-137.13) (  -0.83,-140.71)  408.20                80
 10/06/2021   22:31:20   (  -0.02,-137.12) (   0.18,-136.18)  106.70                80
 10/08/2021   10:50:28   (   0.02,-137.09) (   0.99,-141.45)  496.88                80
 10/09/2021   10:34:23   (   0.02,-137.07) (  -0.02,-136.92)   17.38                80
 10/11/2021   22:34:55   (  -0.02,-137.01) (  -0.16,-137.69)   77.05                80
 10/12/2021   22:18:51   (  -0.01,-136.98) (   0.85,-133.16)  436.42                80