Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 12 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)
 12/19/2021   22:11:43   (   0.03,-127.81) (   0.26,-126.75)  121.02                80
 12/21/2021   10:31:24   (  -0.05,-127.87) (   0.93,-132.14)  487.26                80
 12/22/2021   10:15:42   (  -0.04,-127.90) (  -0.06,-127.70)   23.11                80
 12/24/2021   22:17:10   (   0.04,-127.96) (  -0.12,-128.69)   83.03                80
 12/25/2021   22:01:28   (   0.04,-127.99) (   0.88,-124.24)  427.03                80
 12/27/2021   10:21:09   (  -0.05,-128.04) (   0.33,-129.63)  182.08                80
 12/28/2021   10:05:27   (  -0.04,-128.07) (  -0.67,-125.19)  327.63                80
 12/29/2021   22:25:18   (   0.06,-128.08) (  -0.50,-130.63)  289.57                80
 12/30/2021   22:09:36   (   0.05,-128.10) (   0.51,-126.18)  219.75                80
 01/01/2022   10:29:17   (  -0.05,-128.14) (   0.71,-131.57)  390.67                80