Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/23/2021   10:03:02   (   0.03,-127.74) (  -0.15,-127.05)   79.67                80
 04/25/2021   22:05:39   (  -0.03,-127.63) (  -0.03,-127.66)    3.29                80
 04/28/2021   10:10:50   (   0.03,-127.55) (   0.17,-128.25)   79.91                80
 04/29/2021   09:49:13   (   0.02,-127.50) (  -0.86,-123.67)  437.56                80
 04/30/2021   22:10:48   (  -0.03,-127.41) (  -0.34,-128.87)  166.34                80
 05/01/2021   21:54:31   (  -0.02,-127.36) (   0.69,-124.28)  351.63                80
 05/03/2021   10:15:58   (   0.03,-127.32) (   0.54,-129.45)  243.41                80
 05/04/2021   09:54:20   (   0.03,-127.27) (  -0.50,-124.86)  273.79                80
 05/05/2021   22:15:56   (  -0.04,-127.16) (  -0.70,-130.06)  331.56                80
 05/06/2021   21:59:38   (  -0.03,-127.11) (   0.33,-125.48)  186.37                80