Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/13/2021   10:20:23   (   0.25,-128.11) (   0.65,-129.97)  211.86                80
 10/14/2021   10:04:04   (   0.26,-128.13) (  -0.37,-125.37)  314.58                80
 10/15/2021   22:23:01   (  -0.23,-128.15) (  -0.76,-130.59)  277.90                80
 10/16/2021   22:06:42   (  -0.24,-128.17) (   0.25,-125.99)  248.63                80
 10/18/2021   10:25:30   (   0.21,-128.23) (   0.85,-131.18)  334.65                80
 10/19/2021   10:09:11   (   0.23,-128.26) (  -0.17,-126.58)  191.90                80
 10/20/2021   22:28:06   (  -0.20,-128.27) (  -1.02,-131.78)  400.77                80
 10/21/2021   22:11:49   (  -0.21,-128.30) (   0.06,-127.20)  125.54                80
 10/23/2021   10:30:35   (   0.18,-128.35) (   1.09,-132.37)  458.57                80
 10/24/2021   10:14:17   (   0.20,-128.37) (   0.08,-127.78)   67.25                80