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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/15/2021   21:58:02   (   0.00,-128.00) (   0.61,-125.26)  312.26                80
 04/17/2021   10:19:30   (   0.01,-127.96) (   0.56,-130.43)  282.55                80
 04/18/2021   09:57:53   (   0.00,-127.92) (  -0.46,-125.85)  236.08                80
 04/19/2021   22:19:28   (  -0.01,-127.85) (  -0.75,-131.05)  364.57                80
 04/20/2021   22:03:11   (  -0.01,-127.82) (   0.28,-126.46)  154.54                80
 04/22/2021   10:24:39   (   0.02,-127.78) (   0.90,-131.64)  440.08                80
 04/23/2021   10:03:01   (   0.01,-127.74) (  -0.13,-127.05)   78.04                80
 04/25/2021   22:06:52   (  -0.02,-127.62) (  -0.04,-127.66)    6.26                 7
 04/28/2021   10:10:50   (   0.02,-127.53) (   0.19,-128.25)   83.05                80