Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 5 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/21/2019   10:19:44   (   0.02,-128.43) (   0.99,-132.73)  490.35                80
 05/22/2019   10:03:29   (   0.03,-128.43) (  -0.05,-128.16)   31.31                80
 05/24/2019   22:03:35   (  -0.03,-128.45) (  -0.14,-128.83)   44.28                80
 05/25/2019   21:47:21   (  -0.04,-128.45) (   0.90,-124.26)  477.46                80
 05/27/2019   10:06:13   (   0.02,-128.45) (   0.23,-129.48)  116.12                80
 05/28/2019   09:49:57   (   0.03,-128.45) (  -0.75,-124.90)  405.10                80
 05/29/2019   22:08:59   (  -0.02,-128.45) (  -0.42,-130.14)  193.10                80
 05/30/2019   21:52:44   (  -0.02,-128.45) (   0.63,-125.58)  328.09                80
 06/01/2019   10:11:37   (   0.00,-128.45) (   0.51,-130.79)  265.98                80
 06/02/2019   09:55:21   (   0.01,-128.45) (  -0.48,-126.21)  254.43                80