Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 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)
 10/19/2021   10:09:11   (   0.23,-128.25) (  -0.17,-126.58)  191.12                80
 10/20/2021   22:28:06   (  -0.20,-128.27) (  -1.02,-131.78)  401.21                80
 10/21/2021   22:11:49   (  -0.21,-128.29) (   0.06,-127.20)  124.89                80
 10/23/2021   10:30:35   (   0.18,-128.33) (   1.08,-132.37)  460.18                80
 10/24/2021   10:14:16   (   0.20,-128.34) (   0.06,-127.77)   65.38                80
 10/26/2021   22:16:54   (  -0.18,-128.36) (  -0.17,-128.39)    4.01                80
 10/29/2021   10:16:42   (   0.17,-128.41) (   0.28,-128.97)   64.42                80
 10/30/2021   10:00:24   (   0.18,-128.41) (  -0.74,-124.38)  460.35                80
 10/31/2021   22:19:19   (  -0.15,-128.41) (  -0.44,-129.58)  134.36                80
 11/01/2021   22:03:00   (  -0.16,-128.42) (   0.59,-124.99)  390.35                80