Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 7 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/06/2021   10:11:39   (  -0.03,-128.13) (   0.80,-131.90)  429.40                80
 07/07/2021   09:55:35   (  -0.03,-128.10) (  -0.18,-127.36)   83.55                80
 07/09/2021   21:56:09   (   0.04,-127.94) (   0.02,-128.14)   23.06                80
 07/10/2021   21:40:04   (   0.03,-127.90) (   1.00,-123.61)  489.81                80
 07/12/2021   09:59:14   (  -0.05,-127.93) (   0.16,-128.88)  108.91                80
 07/13/2021   09:43:09   (  -0.04,-127.89) (  -0.81,-124.35)  403.40                80
 07/14/2021   22:02:26   (   0.05,-127.75) (  -0.38,-129.65)  216.90                80
 07/15/2021   21:46:22   (   0.04,-127.71) (   0.60,-125.12)  295.37                80
 07/17/2021   10:05:31   (  -0.06,-127.73) (   0.56,-130.39)  303.85                80
 07/18/2021   09:49:28   (  -0.06,-127.69) (  -0.48,-125.87)  207.85                80
 07/19/2021   22:08:45   (   0.08,-127.54) (  -0.71,-131.18)  414.05                80