Positions of radiants for the particles representing the modeled stream of comet C/1917 F1, which currently move in orbits, along which they can approach the Earth’s orbit within 0.05 AU. The positions for the streams modeled in the perihelia of the comet passed at times of 10, 20, 30, 40, and 50 kyr before the present are shown in the plots a), b), c), d), and e), respectively. The stream can be split up to four filaments with four distinct radiant areas. The enumeration of the filaments is given in plot e) with the complete set of filaments (F1 to F4). The radiants are shown in the Hammer projection of the equatorial coordinate frame. The sinusoid-like curve illustrates the ecliptic.