Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 1 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/20/2021   22:09:52   (  -0.31,-127.94) (  -0.47,-128.57)   71.52                80
 01/21/2021   21:48:15   (  -0.29,-127.92) (   0.59,-123.99)  447.77                80
 01/23/2021   10:12:23   (   0.33,-127.82) (   0.64,-129.15)  151.99                80
 01/24/2021   09:50:46   (   0.31,-127.79) (  -0.42,-124.58)  366.96                80
 01/25/2021   22:15:02   (  -0.35,-127.79) (  -0.81,-129.78)  226.75                80
 01/26/2021   21:53:26   (  -0.33,-127.76) (   0.25,-125.20)  291.78                80
 01/28/2021   10:17:33   (   0.37,-127.66) (   0.97,-130.37)  309.25                80
 01/29/2021   09:55:56   (   0.36,-127.62) (  -0.03,-125.78)  208.97                80
 01/30/2021   22:20:13   (  -0.39,-127.61) (  -1.14,-131.00)  385.90                80
 01/31/2021   21:58:36   (  -0.37,-127.57) (  -0.14,-126.41)  132.14                80