Have you checked the performance of the truncated algorithm against the un-truncated version over time? I'd be interested to see how the reduction in variable length affects the performance over, say, 25 years.
I can't say I have. I will clean it up a bit and try that in a few days. I would not have thought that it would affect it more than say .5deg which for the proposed projects that would not make any difference.
I will check it against stellarium (which contains a highly accurate algorithm, more accurate than this).
I will check it though (or you can ;))
Mowcius