Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/22/2021   10:15:42   (  -0.04,-127.90) (  -0.07,-127.69)   23.14                80
 12/24/2021   22:17:10   (   0.04,-127.96) (  -0.12,-128.69)   82.39                80
 12/25/2021   22:01:28   (   0.04,-127.99) (   0.88,-124.24)  427.73                80
 12/27/2021   10:21:09   (  -0.05,-128.04) (   0.32,-129.63)  181.67                80
 12/28/2021   10:05:27   (  -0.05,-128.07) (  -0.67,-125.19)  328.09                80
 12/29/2021   22:25:18   (   0.06,-128.09) (  -0.50,-130.63)  288.63                80
 12/30/2021   22:09:36   (   0.05,-128.11) (   0.51,-126.18)  220.75                80
 01/01/2022   10:29:17   (  -0.05,-128.15) (   0.71,-131.57)  389.93                80
 01/02/2022   10:13:34   (  -0.04,-128.16) (  -0.29,-127.12)  118.82                80
 01/03/2022   22:33:25   (   0.05,-128.17) (  -0.92,-132.55)  499.24                80
 01/04/2022   22:17:42   (   0.05,-128.19) (   0.08,-128.11)    9.58                80