Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 9 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/10/2019   10:00:10   (   0.36,-128.22) (   0.34,-128.06)   18.30                80
 09/12/2019   22:02:55   (  -0.35,-128.14) (  -0.46,-128.74)   67.69                80
 09/13/2019   21:46:40   (  -0.35,-128.12) (   0.54,-124.16)  451.17                80
 09/15/2019   10:08:11   (   0.34,-128.11) (   0.64,-129.36)  142.95                80
 09/16/2019   09:46:37   (   0.35,-128.08) (  -0.42,-124.80)  375.30                80
 09/17/2019   22:08:17   (  -0.34,-128.01) (  -0.77,-130.04)  230.63                80
 09/18/2019   21:52:02   (  -0.34,-127.98) (   0.23,-125.46)  287.64                80
 09/20/2019   10:10:53   (   0.33,-127.97) (   0.94,-130.66)  306.95                80
 09/21/2019   09:51:57   (   0.33,-127.94) (  -0.06,-126.08)  210.40                80
 09/22/2019   22:13:39   (  -0.32,-127.84) (  -1.07,-131.34)  397.98                80
 09/23/2019   21:57:23   (  -0.32,-127.80) (  -0.07,-126.76)  119.25                80