Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/09/2021   22:18:27   (  -0.25,-128.18) (  -0.82,-130.72)  290.08                80
 01/10/2021   21:56:51   (  -0.23,-128.16) (   0.24,-126.14)  230.21                80
 01/12/2021   10:20:58   (   0.27,-128.08) (   1.02,-131.31)  367.71                80
 01/13/2021   09:59:21   (   0.25,-128.07) (  -0.04,-126.73)  152.47                80
 01/14/2021   22:23:38   (  -0.29,-128.09) (  -1.17,-131.93)  438.95                80
 01/15/2021   22:02:01   (  -0.27,-128.07) (  -0.11,-127.36)   81.08                80
 01/18/2021   10:07:12   (   0.29,-127.97) (   0.29,-127.94)    3.18                80
 01/20/2021   22:09:52   (  -0.31,-127.97) (  -0.45,-128.57)   68.76                80
 01/21/2021   21:48:15   (  -0.29,-127.95) (   0.62,-124.00)  450.96                80