Simultaneous Nadir Overpasses (SNOs) between FY3D and NPP
TLE Epoch: 2022 12 26.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(NPP) NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/26/2022   03:16:23   (  81.21,  70.81) 12/26/2022   03:15:17  (  81.21,  70.71)    1.68                66
 12/26/2022   04:07:09   ( -81.21,-121.90) 12/26/2022   04:06:02  ( -81.21,-122.02)    2.13                67
 12/26/2022   04:57:54   (  81.21,  45.32) 12/26/2022   04:56:46  (  81.21,  45.33)    0.41                68
 12/26/2022   05:48:39   ( -81.21,-147.00) 12/26/2022   05:47:30  ( -81.20,-147.01)    0.50                69
 12/26/2022   06:39:25   (  81.21,  20.22) 12/26/2022   06:38:15  (  81.20,  20.33)    2.06                70
 12/26/2022   07:30:11   ( -81.21,-172.48) 12/26/2022   07:29:00  ( -81.20,-172.39)    1.58                71
 12/26/2022   08:20:57   (  81.21,  -5.27) 12/26/2022   08:19:46  (  81.21,  -5.43)    2.73                71
 12/26/2022   09:11:43   ( -81.21, 162.03) 12/26/2022   09:10:31  ( -81.21, 161.84)    3.20                72
 12/26/2022   10:02:29   (  81.21, -30.76) 12/26/2022   10:01:16  (  81.21, -30.81)    0.94                73
 12/26/2022   10:53:15   ( -81.21, 136.54) 12/26/2022   10:52:01  ( -81.21, 136.46)    1.41                74
 12/26/2022   11:44:00   (  81.21, -55.86) 12/26/2022   11:42:45  (  81.20, -55.81)    1.05                75