For largely astrological treatises that are available in English: look no further than the works of the medieval Persians (Abu Mašar, Bērōnī, etc). Medieval Persians drew heavily from earlier Sasanian sources; even appearing to have copied down the names of the Sasanian bahrs (parts), word for word.

Then you have the works of an Indian astronomer named Varāhamihira (namely the Pañcasiddhāntikā), which preserve a lot of the Sasanians' astronomical expertise. Definitely check those out as well.

Indeed!
I would recommend starting off with the Bundahišn for an understanding of Mazdean cosmology/cosmogony. Personally, I'm not happy with any of the available English translations, but Malandra's translation is satisfactory.

Late Sasanian (6th-7th century CE), for the most part.

Definitely not ideal for flamboyant characters.

Oh those people definitely exist. Neil Patrick Harris is a famous example.

I come with the best of intentions, I promise you. 😂

Fair enough... you're from the Western hemisphere, and certainly much of what counts as "astrology" in your part of the world is – more or less – "space phrenology".

Nevertheless, I invite you to ask me anything you want.

What sucks about astrology, in your opinion?

Could be. But given its use in forming geographical/ethnic names, like Hindūgān (‘Hindus’/‘India’), the -ān in Ērān is perhaps better understood as a gentilic/nominalizing suffix.

فناجین.
Middle Persian borrowings are often pluralized with -āt, but apparently -āt doesn't work for words like finjān or sirdāb.

Interesting observation.
This is an unpopular opinion, but I genuinely believe the first of those correspondences (ž > z) is an oversimplification.

Is it najrib or njarrib?
The latter would be Gulf—where I believe it's also common to employ the singularized form of a first-person plural.