Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 5 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/13/2020   22:10:54   (   0.07,-128.30) (  -0.54,-131.12)  320.93                80
 05/14/2020   21:49:29   (   0.08,-128.30) (   0.49,-126.59)  195.42                80
 05/16/2020   10:13:55   (  -0.06,-128.31) (   0.76,-131.84)  403.77                80
 05/17/2020   09:52:31   (  -0.07,-128.30) (  -0.27,-127.32)  111.92                80
 05/18/2020   22:17:07   (   0.04,-128.29) (  -0.90,-132.62)  493.33                80
 05/19/2020   21:58:22   (   0.06,-128.28) (   0.08,-128.08)   22.77                80
 05/22/2020   10:01:25   (  -0.05,-128.28) (   0.08,-128.82)   61.65                80
 05/23/2020   09:40:00   (  -0.07,-128.26) (  -0.95,-124.29)  453.16                80
 05/24/2020   22:04:35   (   0.04,-128.23) (  -0.27,-129.58)  153.90                80
 05/25/2020   21:43:11   (   0.06,-128.22) (   0.77,-125.05)  360.98                80