Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2020 12 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/11/2020   09:52:17   (   0.02,-128.14) (  -0.16,-127.23)  103.01                80
 12/12/2020   22:16:53   (  -0.06,-128.18) (  -1.02,-132.54)  495.75                80
 12/13/2020   21:55:27   (  -0.04,-128.19) (  -0.01,-128.00)   21.80                80
 12/16/2020   10:01:08   (   0.07,-128.21) (   0.17,-128.73)   59.71                80
 12/17/2020   09:39:42   (   0.04,-128.22) (  -0.85,-124.20)  457.74                80
 12/18/2020   22:04:17   (  -0.08,-128.25) (  -0.39,-129.49)  141.75                80
 12/19/2020   21:42:52   (  -0.06,-128.26) (   0.69,-124.97)  375.39                80
 12/21/2020   10:07:18   (   0.10,-128.26) (   0.54,-130.22)  224.10                80
 12/22/2020   09:45:52   (   0.08,-128.27) (  -0.48,-125.69)  293.23                80
 12/23/2020   22:10:27   (  -0.12,-128.30) (  -0.69,-130.99)  306.06                80