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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/06/2021   22:11:37   (  -0.06,-128.44) (  -0.02,-128.19)   28.00                80
 06/09/2021   10:14:07   (   0.05,-128.52) (   0.13,-128.78)   30.40                80
 06/10/2021   09:52:30   (   0.05,-128.52) (  -0.91,-124.20)  492.46                80
 06/11/2021   22:14:06   (  -0.04,-128.43) (  -0.27,-129.40)  110.72                80
 06/12/2021   21:57:48   (  -0.05,-128.43) (   0.78,-124.82)  412.13                80
 06/14/2021   10:19:16   (   0.04,-128.50) (   0.37,-130.00)  170.14                80
 06/15/2021   09:57:37   (   0.05,-128.49) (  -0.62,-125.40)  352.16                80
 06/16/2021   22:19:13   (  -0.04,-128.40) (  -0.56,-130.61)  252.47                80
 06/17/2021   22:02:56   (  -0.05,-128.39) (   0.49,-126.02)  269.96                80
 06/19/2021   10:21:43   (   0.04,-128.46) (   0.65,-131.20)  312.48                80