Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/22/2021   10:24:39   (   0.03,-127.78) (   0.88,-131.64)  438.86                80
 04/23/2021   10:03:02   (   0.02,-127.74) (  -0.15,-127.05)   79.45                80
 04/25/2021   22:05:39   (  -0.03,-127.63) (  -0.03,-127.66)    4.06                80
 04/28/2021   10:10:50   (   0.03,-127.54) (   0.17,-128.25)   80.75                80
 04/29/2021   09:49:13   (   0.02,-127.49) (  -0.86,-123.67)  436.61                80
 04/30/2021   22:10:48   (  -0.02,-127.40) (  -0.34,-128.87)  167.71                80
 05/01/2021   21:54:31   (  -0.02,-127.35) (   0.69,-124.28)  350.12                80
 05/03/2021   10:15:58   (   0.03,-127.30) (   0.53,-129.45)  244.89                80
 05/04/2021   09:54:20   (   0.02,-127.25) (  -0.50,-124.86)  272.20                80