Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 4 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/25/2021   22:05:39   (  -0.03,-127.64) (  -0.02,-127.67)    3.31                80
 04/28/2021   10:10:49   (   0.03,-127.55) (   0.21,-128.24)   79.37                80
 04/29/2021   09:49:12   (   0.02,-127.51) (  -0.82,-123.66)  438.24                80
 04/30/2021   22:10:47   (  -0.03,-127.42) (  -0.38,-128.86)  165.15                80
 05/01/2021   21:54:30   (  -0.03,-127.37) (   0.65,-124.27)  352.98                80
 05/03/2021   10:15:58   (   0.04,-127.33) (   0.51,-129.45)  242.14                80
 05/04/2021   09:54:20   (   0.03,-127.28) (  -0.53,-124.87)  275.18                80
 05/05/2021   22:15:56   (  -0.04,-127.17) (  -0.67,-130.07)  329.67                80
 05/06/2021   21:59:37   (  -0.04,-127.13) (   0.31,-125.47)  188.44                80
 05/08/2021   10:21:06   (   0.04,-127.09) (   0.85,-130.65)  405.53                80