Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/18/2021   10:07:12   (   0.29,-127.95) (   0.30,-127.94)    1.89                80
 01/20/2021   22:09:52   (  -0.31,-127.95) (  -0.46,-128.57)   71.15                80
 01/21/2021   21:48:15   (  -0.29,-127.92) (   0.60,-123.99)  448.25                80
 01/23/2021   10:12:23   (   0.33,-127.83) (   0.64,-129.16)  151.46                80
 01/24/2021   09:50:46   (   0.31,-127.80) (  -0.42,-124.58)  367.62                80
 01/25/2021   22:15:03   (  -0.35,-127.81) (  -0.81,-129.78)  225.77                80
 01/26/2021   21:53:26   (  -0.34,-127.77) (   0.26,-125.21)  292.87                80
 01/28/2021   10:17:33   (   0.37,-127.67) (   0.97,-130.37)  308.16                80
 01/29/2021   09:55:56   (   0.36,-127.63) (  -0.03,-125.78)  210.19                80