Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/08/2021   10:15:16   (   0.28,-127.96) (   0.44,-128.76)   90.95                80
 10/09/2021   09:58:58   (   0.30,-127.99) (  -0.58,-124.17)  436.21                80
 10/10/2021   22:17:54   (  -0.27,-128.02) (  -0.56,-129.38)  155.38                80
 10/11/2021   22:01:36   (  -0.28,-128.04) (   0.46,-124.79)  371.24                80
 10/13/2021   10:20:23   (   0.25,-128.10) (   0.64,-129.97)  212.40                80
 10/14/2021   10:04:05   (   0.26,-128.13) (  -0.37,-125.38)  314.00                80
 10/15/2021   22:23:01   (  -0.23,-128.15) (  -0.76,-130.59)  278.38                80
 10/16/2021   22:06:42   (  -0.24,-128.17) (   0.26,-126.00)  248.11                80
 10/18/2021   10:25:29   (   0.21,-128.23) (   0.90,-131.17)  335.45                80
 10/19/2021   10:09:11   (   0.23,-128.25) (  -0.18,-126.59)  191.06                80
 10/20/2021   22:28:07   (  -0.20,-128.27) (  -1.01,-131.79)  401.48                80
 10/21/2021   22:11:48   (  -0.22,-128.29) (   0.01,-127.19)  124.76                80