Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/12/2021   21:57:49   (  -0.04,-128.43) (   0.80,-124.82)  412.05                80
 06/14/2021   10:19:16   (   0.04,-128.50) (   0.35,-130.00)  170.44                80
 06/15/2021   09:57:38   (   0.05,-128.49) (  -0.64,-125.40)  351.88                80
 06/16/2021   22:19:14   (  -0.04,-128.40) (  -0.55,-130.61)  252.62                80
 06/17/2021   22:02:56   (  -0.05,-128.39) (   0.49,-126.02)  269.78                80
 06/19/2021   10:21:44   (   0.04,-128.45) (   0.65,-131.20)  312.89                80
 06/20/2021   10:05:26   (   0.04,-128.44) (  -0.39,-126.61)  208.85                80
 06/21/2021   22:24:23   (  -0.03,-128.33) (  -0.79,-131.82)  397.45                80
 06/22/2021   22:08:04   (  -0.03,-128.32) (   0.19,-127.22)  123.98                80
 06/24/2021   10:26:51   (   0.02,-128.37) (   0.95,-132.40)  459.82                80
 06/25/2021   10:10:34   (   0.02,-128.35) (  -0.10,-127.82)   61.04                80