Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 3 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/11/2021   10:21:18   (  -0.11,-128.36) (   0.49,-131.13)  315.43                80
 03/12/2021   09:59:40   (  -0.12,-128.37) (  -0.52,-126.54)  207.80                80
 03/13/2021   22:21:17   (   0.11,-128.41) (  -0.64,-131.76)  381.54                80
 03/14/2021   22:05:00   (   0.11,-128.42) (   0.38,-127.17)  142.26                80
 03/16/2021   10:26:28   (  -0.10,-128.41) (   0.76,-132.35)  449.47                80
 03/17/2021   10:04:51   (  -0.11,-128.41) (  -0.25,-127.77)   73.30                80
 03/19/2021   22:07:31   (   0.10,-128.44) (   0.13,-128.40)    5.65                80
 03/22/2021   10:12:40   (  -0.09,-128.42) (   0.07,-128.98)   64.62                80
 03/23/2021   09:51:04   (  -0.10,-128.41) (  -1.01,-124.40)  457.31                80