On the 15th July, the Earth begins to intersect the meteoroid stream that makes up the Persied meteor shower. At this time, the angle between the meteoroid's heliocentric velocity and the Apex of the Earth's way is 72. The Earth is travelling at a velocity (Ve) of approximately 29.7847 km/s and the meteoroids are travelling at heliocentric velocity (VH) of 41.25km/sec.

The construction shows that the meteoroid's geocentric velocity (VH) is now 58km/s and the angle between the apex and the radiant is 42. 

On the 25th August, the Earth leaves the meteoroid stream that makes up the Persied meteor shower. At this time, the angle between the meteoroid's heliocentric velocity and the Apex of the earth's way is 66. The Earth is travelling at a velocity (Ve) of approximately 29.7847 km/s and the meteoroids are travelling at heliocentric velocity (VH) of 41.25km/sec.

Repeating the same vector addition as above, we now find that the meteoroid's geocentric velocity (VG) is now 60km/s and the angle between the apex and the radiant is 39.