Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 3 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/09/2021   21:59:50   (   0.13,-128.38) (   0.66,-125.95)  276.86                80
 03/11/2021   10:21:17   (  -0.11,-128.36) (   0.53,-131.12)  315.30                80
 03/12/2021   09:59:40   (  -0.12,-128.37) (  -0.54,-126.55)  207.99                80
 03/13/2021   22:21:18   (   0.11,-128.41) (  -0.62,-131.76)  381.29                80
 03/14/2021   22:05:00   (   0.11,-128.42) (   0.40,-127.18)  142.57                80
 03/16/2021   10:26:28   (  -0.10,-128.41) (   0.80,-132.35)  449.03                80
 03/17/2021   10:04:51   (  -0.11,-128.41) (  -0.28,-127.77)   73.86                80
 03/19/2021   22:10:10   (   0.10,-128.45) (   0.10,-128.39)    6.17                80
 03/22/2021   10:12:41   (  -0.09,-128.42) (   0.03,-128.98)   63.71                80