Before buying rakhi, you should know their zodiac signs. As the zodiac sign has the same impact on our lives as oxygen on our breath. Zodiac signs and planets can influence our life's happenings by and large. These influences are often triggered by the dates of various Hindu festivals. This year the Raksha Bandhan falls on 22 August on full moon lunar day, marking the end of Sawan. The date of Raksha Bandhan might change every year, however, the 'tithi'; and auspiciousness of the event remains the same. To make your brother's life prosperous every sister should buy rakhi as per their zodiac sign. Let's know what color of rakhi you should tie your brother on this Raksha Bandhan.
https://en.myjyotish.com/en/astrology-blogs/do-these-remedies-to-please-lord-ganesha-and-lord-shiva-together