Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/27/2021   22:10:32   (   0.00,-128.25) (  -0.06,-128.43)   20.84                80
 06/30/2021   10:13:02   (  -0.01,-128.28) (   0.16,-129.02)   83.56                80
 07/01/2021   09:56:45   (   0.00,-128.26) (  -0.89,-124.43)  437.52                80
 07/02/2021   22:15:40   (   0.01,-128.15) (  -0.33,-129.63)  169.51                80
 07/03/2021   21:59:22   (   0.01,-128.13) (   0.72,-125.05)  351.60                80
 07/05/2021   10:18:10   (  -0.02,-128.18) (   0.43,-130.22)  233.04                80
 07/06/2021   10:01:51   (  -0.02,-128.15) (  -0.56,-125.62)  287.40                80
 07/07/2021   22:20:48   (   0.04,-128.02) (  -0.59,-130.84)  321.24                80
 07/08/2021   22:04:29   (   0.03,-127.99) (   0.41,-126.24)  199.04                80
 07/10/2021   10:23:17   (  -0.05,-128.03) (   0.69,-131.43)  386.49                80
 07/11/2021   10:06:59   (  -0.04,-128.00) (  -0.30,-126.83)  133.29                80