Simultaneous Nadir Overpasses (SNOs) between FY3D and METOP-A
TLE Epoch: 2021 7 4.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(METOP-A) METOP-A Lat/Lon    Distance(km)  Time Diff(sec)
 07/17/2021   14:28:07   (  77.59, -56.71) 07/17/2021   14:29:15  (  77.56, -54.08)   62.92                68
 07/17/2021   15:18:49   ( -77.48, 111.12) 07/17/2021   15:20:00  ( -77.42, 112.59)   36.52                71
 07/17/2021   16:09:29   (  77.30, -80.74) 07/17/2021   16:10:43  (  77.28, -80.63)    3.20                74
 07/17/2021   17:00:13   ( -77.27,  86.69) 07/17/2021   17:01:25  ( -77.27,  86.62)    1.93                72
 07/17/2021   17:50:57   (  77.26,-105.93) 07/17/2021   17:52:05  (  77.26,-106.05)    2.99                68
 07/17/2021   18:41:42   ( -77.28,  61.31) 07/17/2021   18:42:46  ( -77.29,  61.38)    2.30                64
 07/17/2021   19:32:26   (  77.26,-131.31) 07/17/2021   19:33:26  (  77.29,-131.29)    2.97                60
 07/17/2021   20:23:11   ( -77.28,  35.92) 07/17/2021   20:24:08  ( -77.27,  35.96)    1.36                57
 07/17/2021   21:13:55   (  77.26,-156.69) 07/17/2021   21:14:48  (  77.27,-156.71)    0.64                53
 07/17/2021   22:04:40   ( -77.28,  10.54) 07/17/2021   22:05:30  ( -77.25,  10.54)    3.53                50
 07/17/2021   22:55:24   (  77.27, 177.92) 07/17/2021   22:56:10  (  77.25, 177.86)    2.52                46
 07/17/2021   23:46:09   ( -77.28, -14.84) 07/17/2021   23:46:51  ( -77.27, -14.70)    3.48                42
 07/18/2021   00:36:53   (  77.27, 152.54) 07/18/2021   00:37:31  (  77.27, 152.62)    2.05                38
 07/18/2021   01:27:37   ( -77.25, -40.03) 07/18/2021   01:28:13  ( -77.26, -40.13)    2.56                36
 07/18/2021   02:18:22   (  77.27, 127.16) 07/18/2021   02:18:53  (  77.25, 127.20)    2.36                31
 07/18/2021   03:09:06   ( -77.25, -65.41) 07/18/2021   03:09:35  ( -77.24, -65.55)    3.53                29
 07/18/2021   03:59:51   (  77.28, 101.78) 07/18/2021   04:00:14  (  77.28, 101.96)    4.50                23