Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 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)
 04/17/2021   10:19:30   (   0.01,-127.96) (   0.56,-130.43)  282.34                80
 04/18/2021   09:57:53   (   0.00,-127.92) (  -0.47,-125.85)  236.31                80
 04/19/2021   22:19:28   (  -0.02,-127.85) (  -0.75,-131.05)  364.36                80
 04/20/2021   22:03:11   (  -0.01,-127.82) (   0.28,-126.46)  154.77                80
 04/22/2021   10:24:39   (   0.02,-127.78) (   0.90,-131.64)  439.80                80
 04/23/2021   10:03:02   (   0.02,-127.74) (  -0.13,-127.05)   78.33                80
 04/25/2021   22:08:19   (  -0.02,-127.62) (  -0.06,-127.66)    6.40                80
 04/28/2021   10:10:50   (   0.02,-127.53) (   0.21,-128.25)   82.77                80
 04/29/2021   09:49:14   (   0.01,-127.48) (  -0.88,-123.68)  434.46                80
 04/30/2021   22:10:49   (  -0.02,-127.38) (  -0.33,-128.88)  170.25                80