First of all, Veda is not everything. There are Upanishads, Samhita and Other relevant Books on different topics. Veda is not just 5000 years old, as we are wrongly taught.
Second, there where Rishis an Maharshis (Readers and Professor in modern context). One of the Maharshi was Maharshi Bhrugu. Who wrote a book on prediction called "Bhrugu Samhita". Similarly, Maharshi Charak wrote "Charak Samhita" (Ayurveda).
Indian Astrology is very complex maths. Calculation of Planet, its Degree, its Dasha and antardasha everything is based on a solid maths. And according to modern science and astronomy, not a single calculation of Astrology is proven wrong till date.
Now, just imagine, Bhrugu calculated everything without Telescope and Modern equipment thousands of year back.
So, logically you can prove anything, but the facts remains facts even if we can not see it.
From a reply to astrological post.