Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 3 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/08/2021   22:16:07   (   0.13,-128.37) (  -0.34,-130.54)  247.22                80
 03/09/2021   21:59:50   (   0.13,-128.38) (   0.68,-125.95)  276.85                80
 03/11/2021   10:21:17   (  -0.11,-128.36) (   0.52,-131.13)  315.15                80
 03/12/2021   09:59:41   (  -0.12,-128.37) (  -0.56,-126.55)  208.20                80
 03/13/2021   22:21:17   (   0.11,-128.42) (  -0.66,-131.76)  381.10                80
 03/14/2021   22:05:01   (   0.11,-128.43) (   0.42,-127.18)  142.83                80
 03/16/2021   10:26:28   (  -0.10,-128.41) (   0.78,-132.35)  448.64                80
 03/17/2021   10:04:50   (  -0.11,-128.42) (  -0.23,-127.76)   74.30                80
 03/19/2021   22:10:10   (   0.10,-128.45) (   0.11,-128.39)    6.49                80