This is essentially the same question you asked, with a simpler example, in an earlier post. And non-procedural solutions would be similar. Of course you may use Table, again with Flatten at level 1 to remove one level of nesting:
There are various alternatives to the 2nd and 3rd arguments of Outer there. E.g., Range[30, 45, 5] and Range[-270, -240, 10]. In fact, for a larger-scale problem the latter are doubtless more efficient than what I showed, which involved multiplication.
Both solutions above give exact integers. You may then apply N to the entire result to get the approximate reals (with decimal points) that you requested.