Why Did Randomness Create Only One Sun

श्री-भगवान् उवाच
इमं विवस्वते योगं
प्रोक्तवान् अहम् अव्ययम्
विवस्वान् मनवे प्राह
मनुर् इक्ष्वाकवे ’ब्रवीत्

“The Blessed Lord said: I instructed this imperishable science of yoga to the sun-god, Vivasvan, and Vivasvan instructed it to Manu, the father of mankind, and Manu in turn instructed it to Ikshvaku.” (Bhagavad-gita, 4.1)