Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 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)
 10/21/2021   22:11:48   (  -0.21,-128.29) (   0.01,-127.18)  125.09                80
 10/23/2021   10:30:35   (   0.18,-128.32) (   1.08,-132.37)  460.47                80
 10/24/2021   10:14:16   (   0.20,-128.34) (   0.06,-127.77)   65.02                80
 10/26/2021   22:16:54   (  -0.18,-128.36) (  -0.16,-128.39)    4.50                80
 10/29/2021   10:16:42   (   0.17,-128.40) (   0.28,-128.97)   65.15                80
 10/30/2021   10:00:24   (   0.18,-128.41) (  -0.75,-124.38)  459.56                80
 10/31/2021   22:19:19   (  -0.15,-128.40) (  -0.43,-129.58)  134.91                80
 11/01/2021   22:03:00   (  -0.16,-128.41) (   0.60,-124.99)  389.72                80
 11/03/2021   10:21:47   (   0.13,-128.43) (   0.55,-130.16)  197.74                80