Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 12 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/21/2019   22:09:59   (   0.04,-128.04) (  -0.48,-130.49)  279.11                80
 12/22/2019   21:53:43   (   0.03,-128.06) (   0.48,-125.90)  245.78                80
 12/24/2019   10:12:35   (  -0.04,-128.14) (   0.63,-131.12)  338.94                80
 12/25/2019   09:56:20   (  -0.03,-128.17) (  -0.39,-126.54)  185.70                80
 12/26/2019   22:15:19   (   0.04,-128.17) (  -0.77,-131.78)  410.65                80
 12/27/2019   21:59:04   (   0.03,-128.20) (   0.26,-127.20)  113.61                80
 12/29/2019   10:17:55   (  -0.04,-128.27) (   0.91,-132.40)  471.94                80
 12/30/2019   10:01:39   (  -0.03,-128.29) (  -0.12,-127.83)   52.37                80
 01/01/2020   22:01:43   (   0.04,-128.31) (  -0.02,-128.49)   20.34                80