Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 4 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/28/2021   10:07:09   (   0.04,-127.55) (   0.62,-130.20)  301.33                80
 04/29/2021   09:45:44   (   0.03,-127.50) (  -0.38,-125.66)  210.05                80
 04/30/2021   22:07:39   (  -0.03,-127.42) (  -0.83,-130.95)  402.91                80
 05/01/2021   21:51:34   (  -0.03,-127.38) (   0.16,-126.42)  109.02                80
 05/03/2021   10:13:20   (   0.04,-127.33) (   1.04,-131.68)  496.03                80
 05/04/2021   09:51:55   (   0.03,-127.28) (  -0.02,-127.15)   15.34                80
 05/06/2021   21:55:05   (  -0.04,-127.14) (  -0.19,-127.91)   87.56                80
 05/07/2021   21:39:00   (  -0.03,-127.09) (   0.81,-123.37)  424.33                80
 05/09/2021   10:00:46   (   0.04,-127.05) (   0.39,-128.63)  180.39                80
 05/10/2021   09:39:21   (   0.03,-126.99) (  -0.61,-124.09)  330.40                80