Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/20/2021   22:03:10   (  -0.02,-127.82) (   0.26,-126.45)  155.45                80
 04/22/2021   10:24:39   (   0.03,-127.78) (   0.91,-131.63)  439.03                80
 04/23/2021   10:03:01   (   0.02,-127.74) (  -0.12,-127.04)   79.23                80
 04/25/2021   22:08:19   (  -0.03,-127.62) (  -0.06,-127.66)    5.24                80
 04/28/2021   10:10:50   (   0.02,-127.54) (   0.20,-128.25)   81.19                80
 04/29/2021   09:49:12   (   0.01,-127.49) (  -0.83,-123.66)  436.12                80
 04/30/2021   22:10:48   (  -0.02,-127.39) (  -0.37,-128.86)  168.32                80
 05/01/2021   21:54:30   (  -0.02,-127.34) (   0.67,-124.28)  349.46                80
 05/03/2021   10:15:58   (   0.03,-127.30) (   0.50,-129.46)  245.55                80