Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/12/2021   10:20:58   (   0.27,-128.08) (   1.02,-131.30)  367.91                80
 01/13/2021   09:59:21   (   0.25,-128.06) (  -0.04,-126.73)  152.22                80
 01/14/2021   22:23:38   (  -0.29,-128.08) (  -1.17,-131.93)  439.10                80
 01/15/2021   22:02:01   (  -0.27,-128.07) (  -0.11,-127.36)   80.88                80
 01/18/2021   10:07:12   (   0.29,-127.97) (   0.29,-127.94)    2.64                80
 01/20/2021   22:09:52   (  -0.31,-127.97) (  -0.45,-128.57)   69.23                80
 01/21/2021   21:48:15   (  -0.29,-127.94) (   0.61,-124.00)  450.42                80
 01/23/2021   10:12:23   (   0.33,-127.85) (   0.62,-129.16)  148.94                80
 01/24/2021   09:50:46   (   0.31,-127.83) (  -0.44,-124.58)  370.42                80