Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 12 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/09/2019   09:55:23   (   0.00,-128.19) (  -0.18,-127.32)   99.22                80
 12/11/2019   21:55:53   (   0.00,-128.08) (  -0.02,-128.08)    2.60                80
 12/14/2019   09:58:55   (  -0.01,-128.03) (   0.16,-128.82)   89.63                80
 12/15/2019   09:42:49   (   0.00,-127.99) (  -0.84,-124.28)  423.20                80
 12/16/2019   22:02:04   (   0.02,-127.90) (  -0.36,-129.58)  191.40                80
 12/17/2019   21:45:59   (   0.01,-127.87) (   0.64,-125.05)  321.23                80
 12/19/2019   10:05:05   (  -0.03,-127.84) (   0.56,-130.31)  282.35                80
 12/20/2019   09:49:00   (  -0.02,-127.80) (  -0.45,-125.77)  230.14                80
 12/21/2019   22:08:15   (   0.03,-127.70) (  -0.75,-131.08)  384.98                80