Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2021 1 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)
 01/08/2021   22:10:43   (  -0.23,-128.19) (  -0.88,-131.04)  325.02                80
 01/09/2021   21:49:18   (  -0.21,-128.17) (   0.14,-126.51)  189.14                80
 01/11/2021   10:13:45   (   0.25,-128.10) (   1.07,-131.77)  418.17                80
 01/12/2021   09:52:21   (   0.23,-128.09) (   0.06,-127.24)   95.75                80
 01/14/2021   21:55:33   (  -0.25,-128.09) (  -0.24,-128.02)    7.88                80
 01/17/2021   10:01:16   (   0.28,-127.99) (   0.44,-128.75)   86.11                80
 01/18/2021   09:39:51   (   0.25,-127.98) (  -0.58,-124.22)  427.64                80
 01/19/2021   22:04:27   (  -0.29,-127.99) (  -0.61,-129.52)  174.13                80
 01/20/2021   21:43:03   (  -0.27,-127.97) (   0.40,-125.00)  339.41                80