Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/17/2021   22:02:56   (  -0.05,-128.39) (   0.46,-126.01)  269.92                80
 06/19/2021   10:21:43   (   0.04,-128.45) (   0.68,-131.19)  312.78                80
 06/20/2021   10:05:26   (   0.04,-128.44) (  -0.37,-126.61)  208.94                80
 06/21/2021   22:24:22   (  -0.03,-128.33) (  -0.82,-131.81)  397.38                80
 06/22/2021   22:08:05   (  -0.03,-128.31) (   0.23,-127.23)  124.01                80
 06/24/2021   10:26:52   (   0.02,-128.37) (   0.91,-132.41)  459.76                80
 06/25/2021   10:10:33   (   0.02,-128.35) (  -0.07,-127.81)   61.13                80
 06/27/2021   22:10:32   (  -0.02,-128.20) (  -0.06,-128.43)   25.57                80
 06/28/2021   21:54:14   (  -0.03,-128.18) (   0.93,-123.83)  495.55                80
 06/30/2021   10:13:01   (   0.02,-128.24) (   0.22,-129.01)   88.34                80