Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 6 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/16/2021   09:46:23   (   0.05,-128.48) (  -0.53,-125.81)  304.71                80
 06/17/2021   22:08:20   (  -0.04,-128.39) (  -0.67,-131.11)  310.24                80
 06/18/2021   21:52:17   (  -0.04,-128.39) (   0.36,-126.59)  205.20                80
 06/20/2021   10:11:26   (   0.03,-128.45) (   0.81,-131.86)  388.97                80
 06/21/2021   09:55:23   (   0.04,-128.44) (  -0.22,-127.34)  125.68                80
 06/22/2021   22:14:40   (  -0.02,-128.33) (  -0.98,-132.64)  491.31                80
 06/23/2021   21:58:36   (  -0.03,-128.31) (  -0.00,-128.10)   23.26                80
 06/26/2021   09:59:01   (   0.02,-128.35) (   0.14,-128.86)   57.98                80
 06/27/2021   09:42:58   (   0.03,-128.33) (  -0.89,-124.33)  456.03                80
 06/28/2021   22:02:14   (  -0.02,-128.21) (  -0.36,-129.62)  161.78                80
 06/29/2021   21:46:11   (  -0.03,-128.19) (   0.68,-125.10)  352.56                80