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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/15/2021   09:57:38   (   0.04,-128.49) (  -0.68,-125.41)  352.15                80
 06/16/2021   22:19:15   (  -0.03,-128.40) (  -0.51,-130.62)  252.19                80
 06/17/2021   22:02:56   (  -0.04,-128.39) (   0.48,-126.02)  270.34                80
 06/19/2021   10:21:44   (   0.03,-128.46) (   0.67,-131.20)  312.17                80
 06/20/2021   10:05:26   (   0.04,-128.45) (  -0.38,-126.61)  209.66                80
 06/21/2021   22:24:22   (  -0.02,-128.34) (  -0.81,-131.82)  396.48                80
 06/22/2021   22:08:05   (  -0.03,-128.33) (   0.24,-127.23)  125.05                80
 06/24/2021   10:26:52   (   0.01,-128.39) (   0.91,-132.41)  458.54                80
 06/25/2021   10:10:34   (   0.02,-128.36) (  -0.08,-127.81)   62.50                80
 06/27/2021   22:10:33   (  -0.02,-128.22) (  -0.06,-128.43)   23.92                80
 06/28/2021   21:54:14   (  -0.03,-128.20) (   0.93,-123.83)  497.31                80