Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 7 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)
 07/19/2021   21:55:46   (   0.08,-127.57) (   0.87,-124.05)  400.73                80
 07/21/2021   10:14:34   (  -0.11,-127.58) (   0.28,-129.23)  187.55                80
 07/22/2021   09:58:16   (  -0.10,-127.54) (  -0.77,-124.64)  330.82                80
 07/23/2021   22:17:11   (   0.12,-127.38) (  -0.44,-129.84)  280.60                80
 07/24/2021   22:00:53   (   0.11,-127.34) (   0.56,-125.24)  237.86                80
 07/26/2021   10:19:41   (  -0.13,-127.35) (   0.54,-130.43)  350.61                80
 07/27/2021   10:03:23   (  -0.12,-127.31) (  -0.45,-125.83)  167.82                80
 07/28/2021   22:22:18   (   0.14,-127.15) (  -0.75,-131.04)  443.56                80
 07/29/2021   22:06:00   (   0.13,-127.10) (   0.25,-126.44)   74.88                80
 08/01/2021   10:05:49   (  -0.14,-127.07) (  -0.14,-127.03)    4.38                80