Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 8 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/01/2021   10:08:33   (  -0.15,-127.94) (  -0.36,-127.07)   99.45                80
 08/03/2021   22:11:11   (   0.17,-127.91) (   0.22,-127.69)   24.48                80
 08/06/2021   10:11:01   (  -0.18,-128.06) (  -0.10,-128.28)   25.84                80
 08/07/2021   09:54:43   (  -0.18,-128.08) (  -1.16,-123.70)  499.88                80
 08/08/2021   22:13:38   (   0.20,-128.01) (  -0.02,-128.90)  102.05                80
 08/09/2021   21:57:21   (   0.19,-128.03) (   1.04,-124.32)  423.23                80
 08/11/2021   10:16:09   (  -0.21,-128.15) (   0.08,-129.50)  153.67                80
 08/12/2021   09:59:51   (  -0.20,-128.17) (  -0.91,-124.90)  371.54                80
 08/13/2021   22:18:46   (   0.22,-128.09) (  -0.25,-130.11)  230.76                80
 08/14/2021   22:02:29   (   0.21,-128.10) (   0.81,-125.53)  293.83                80