How to request BL anchor text...?

I have an odd situation. I have a strong site, with 4000+ back links. The problem is, they all tend to link to me with anchor text that says something like, "If you think the Moon landings were faked, then read [anchor]Bad Astronomy[/anchor]!"

The problem with that is I already have those two words locked up in Google. But I want my SERP to be better for the search term of just "astronomy", say (I usually wind up on thje first page, but it fluctuates from position 5 or so to the bottom of the page). So I'm curious if there is some way, other than sending 4000 emails, to get the BLs to better refelect what I want them to be. I know I can also set u a "Link to me" page where I can ask for some text, but other than that, O SEO Gods, what are my options?

Since your website name is bad astronomy its natural for ppl to link using that anchor text ... this will also help in getting ranked for astronomy ...
u should also target keywords containing astronomy ... just check out wordtracker.com
u can put up articles and tell the ppl who have webpages on astronomy abt those articles ... they may link to those pages also ... with some other anchor text ....