Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/18/2021   22:27:25   (   0.04,-127.78) (  -0.74,-131.19)  389.70                80
 12/19/2021   22:11:43   (   0.03,-127.81) (   0.26,-126.75)  121.03                80
 12/21/2021   10:31:24   (  -0.04,-127.87) (   0.93,-132.14)  487.17                80
 12/22/2021   10:15:42   (  -0.04,-127.90) (  -0.06,-127.70)   23.21                80
 12/24/2021   22:17:10   (   0.04,-127.96) (  -0.12,-128.69)   82.90                80
 12/25/2021   22:01:28   (   0.04,-127.99) (   0.88,-124.24)  427.18                80
 12/27/2021   10:21:09   (  -0.05,-128.04) (   0.32,-129.63)  181.84                80
 12/28/2021   10:05:27   (  -0.04,-128.07) (  -0.68,-125.19)  327.88                80
 12/29/2021   22:25:17   (   0.06,-128.09) (  -0.54,-130.62)  289.32                80
 12/30/2021   22:09:35   (   0.05,-128.10) (   0.46,-126.17)  220.03                80