Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 9 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/17/2021   10:13:49   (   0.38,-128.01) (   0.51,-128.56)   62.68                80
 09/18/2021   09:57:31   (   0.39,-127.99) (  -0.50,-123.97)  457.80                80
 09/19/2021   22:16:26   (  -0.37,-127.89) (  -0.66,-129.17)  146.13                80
 09/20/2021   22:00:08   (  -0.38,-127.87) (   0.34,-124.58)  374.29                80
 09/22/2021   10:18:55   (   0.36,-127.87) (   0.81,-129.75)  215.23                80
 09/23/2021   10:02:38   (   0.37,-127.84) (  -0.26,-125.17)  305.28                80
 09/24/2021   22:21:32   (  -0.35,-127.75) (  -0.97,-130.36)  298.90                80
 09/25/2021   22:05:14   (  -0.36,-127.71) (   0.10,-125.78)  221.03                80
 09/27/2021   10:24:02   (   0.33,-127.71) (   1.04,-130.96)  370.04                80
 09/28/2021   10:07:43   (   0.34,-127.67) (   0.03,-126.36)  149.66                80