LH have you checked with your mother?   Having been quite present and very involved at the time, I do remember my own kid's exact birthtimes very well (I made it a point to look at the clock!)

My own mother remembered mine as well, although not all my siblings are as fortunate. Natal charts are often drawn up without the exact birth time (I think 12 noon is most often used as a last resort). Such reports still provide information that's useful in a general sense, but accuracy is definitely compromised without the exact time of birth.

Also, I'm still thinking about Bill's question about using the moment of conception rather than the moment of birth (first breath) to calculate a natal chart. First, it seems to me that until the first breath is inhaled and exhaled, the baby has yet to "make it's personal mark" on the universe (ie interact with the physical universe as a viable, independant and unique human being.

And second, even if the exact time of conception could be determined (not too likely outside a laboratory), how would it work for twins, then? Would the moment of conception be used, or the moment the zygote divided into two (in the case of identical twins), or possible two separate moments of conception (as in the case of fraternal twins)?