Astrology is a language of symbols and archetypes, rituals are dramatic actions invoking symbolic power. In the ancient world, astrology informed the timing of rituals. Don't let anyone tell you otherwise. Scholars of Jewish Studies call this kind of interpretation an example of “Astro-Magical Biblical Exegesis”. I stand with the great Biblical commentator, Abraham Ibn Ezra, his memory should continue to bless us, who excelled in this field!
Regarding the Passover sacrifice of the lamb, Parsha Behaalotecha tells us precisely when it should take place:
"In the fourteenth day of this month, at dusk, ye shall keep it in its appointed season; according to all the statutes of it, and according to all the ordinances thereof, shall ye keep it."
בארבעה עשר יום בחדש הזה בין הערבים תעשו אתו במועדו ככל חקתיו וככל משפטיו תעשו אתו
On the Full Moon of Chodesh Nissan, in the late afternoon when shkiyah draws close, the Sun is in Aries, symbolized by the Ram, in the 7th House, and the Full Moon is in Libra in the First House.