Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/14/2021   22:14:20   (  -0.00,-128.03) (  -0.39,-129.85)  207.62                80
 04/15/2021   21:58:02   (   0.00,-128.00) (   0.64,-125.26)  312.22                80
 04/17/2021   10:19:30   (   0.01,-127.96) (   0.59,-130.43)  282.64                80
 04/18/2021   09:57:53   (  -0.00,-127.92) (  -0.49,-125.85)  236.03                80
 04/19/2021   22:19:29   (  -0.01,-127.85) (  -0.72,-131.05)  364.59                80
 04/20/2021   22:03:11   (  -0.01,-127.82) (   0.31,-126.47)  154.53                80
 04/22/2021   10:24:39   (   0.02,-127.78) (   0.87,-131.64)  440.13                80
 04/23/2021   10:03:02   (   0.01,-127.74) (  -0.16,-127.06)   78.04                80
 04/25/2021   22:05:40   (  -0.02,-127.62) (  -0.01,-127.67)    6.19                80