Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 2 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/18/2020   21:55:34   (   0.36,-128.42) (   0.82,-126.34)  236.79                80
 02/20/2020   10:14:25   (  -0.36,-128.41) (   0.34,-131.54)  356.66                80
 02/21/2020   09:58:09   (  -0.36,-128.42) (  -0.70,-126.97)  165.98                80
 02/22/2020   22:17:08   (   0.36,-128.45) (  -0.49,-132.19)  427.00                80
 02/23/2020   22:00:53   (   0.36,-128.46) (   0.55,-127.62)   95.65                80
 02/25/2020   10:22:23   (  -0.36,-128.45) (   0.62,-132.82)  497.80                80
 02/26/2020   10:01:14   (  -0.36,-128.45) (  -0.42,-128.24)   24.56                54
 02/28/2020   22:03:32   (   0.36,-128.49) (   0.28,-128.90)   47.00                80
 02/29/2020   21:47:15   (   0.36,-128.49) (   1.27,-124.32)  475.03                80
 03/02/2020   10:08:45   (  -0.35,-128.47) (  -0.10,-129.51)  119.52                80