Don't know if the things I'm going to say have been covered yet, since I'm still reading the topic, but I wanted to put my thoughts down before I get distracted by more thoughts, so my apologies if I rehash or subvert an earlier response.
Number one, Christianity *is* astrological, as was the Judaic faith that preceded it. There are so many astrological symbolisms used in the bible, it's kinda pathetic that Christian scholars haven't noticed them, yet. Revelations is the most prime example, since it's the most-talked-about, the last book, and since it is so flush with astrological symbolism and other related metaphysical principles. The six-winged "living creatures" (or Seraphim, the angels high enough to attend God's throne) are the four fixed signs of the zodiac, as illustrated by the descriptions of them and the fact that the "eyes" all over them ("even under their wings") are analogous to stars, since they look like eyes peering out of the darkness. And since the sky is also called the "heavens", it makes sense that the ancient Hebrews would've considered the fixed signs the attendants of God's throne... in heaven.
Additionally, it should be noted that the original Hebrew word that is so often translated to "astrology" is more-closely translated to "star talkers." But since we have no word for "star talkers" and Christianity rightly feels threatened at the potential for astrology to take it's place as a platform for spiritual development, they used the word astrology when naming off the forms of prognostications taboo to their religion.
There are a number of ideological and sociological reasons for Christians to hate on such a beneficial subject, mostly because they're prone to lapses of logic as promoted by all-consuming zealous faith, but what strikes me as odd is that they don't condemn psychology, even though it shares the same purpose.
Recommendation: Ask your dad, very politely and very respectfully to hear you out on something, but don't tell him what at first. Tell him you want to talk about something and you know he's going to have a hard time with it, but you want to respect his wishes while also growing as a person, so you're trying to go about it the right way. Then sit him down and tell him to just let you speak your part before he interrupts.
After that, tell him calmly, respectfully and confidently that you've read up enough on the subject to know it isn't pagan in origin, it's a science that has been in continual development for thousands of years, and it has substance. It isn't magic, because magic it's ridiculous. (Whether or not that's true isn't relevant; he'll be impressed by your pragmatism, unless I miss my guess.) Then explain that Christianity isn't against astrology, it's against star-worship and "false prophesy." Astrology is neither. It's an examination of the self using statistical comparisons developed by very mathematically brilliant people. Tell him it can be used to make predictions, but about general circumstances, not specific events, so it's no more a "prophesy" than the weather forecast.
But make it abundantly clear that in restricting your ability to learn more on the subject, he's just keeping you from obtaining deeper self-understanding. Ask him that, as a parent, shouldn't he be encouraging your self-knowledge, rather than hobbling that search for your inner self.
I'd follow it up but suggesting that if he honestly feels like it's such a negative thing, would he mind looking into it with you, to try to see the subject from your perspective rather than just saying what the church has told him even though they have avoided learning about it for the exact same reasons he has.
That's my two cents on this. Now to see if you're even still a member here...
Scorpio-risng would help with that. How about "Ranter for rent"!?
