Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/19/2021   22:19:28   (  -0.02,-127.86) (  -0.74,-131.05)  363.95                80
 04/20/2021   22:03:11   (  -0.02,-127.82) (   0.29,-126.46)  155.24                80
 04/22/2021   10:24:39   (   0.03,-127.78) (   0.88,-131.64)  439.23                80
 04/23/2021   10:03:02   (   0.02,-127.74) (  -0.15,-127.05)   78.98                80
 04/25/2021   22:05:39   (  -0.02,-127.62) (  -0.03,-127.66)    4.83                80
 04/28/2021   10:10:50   (   0.02,-127.54) (   0.17,-128.25)   81.65                80
 04/29/2021   09:49:13   (   0.01,-127.49) (  -0.86,-123.67)  435.61                80
 04/30/2021   22:10:48   (  -0.02,-127.39) (  -0.34,-128.87)  168.92                80
 05/01/2021   21:54:31   (  -0.02,-127.34) (   0.69,-124.28)  348.81                80