>> [Guide's] ...apparent RA for the Sun >> was off by only tens of seconds of time compared to the values given in >> the 2007 Observer's Handbook, page 158 (of course, this assumes the >> Handbook values are correct). For the apparent coords of the Sun, you'd really want to take into account one's topocentric position, rather than a straight geocentric position (if real precision actually matters), and it could be that the RASC Handbook positions are geocentric, or maybe for some 'center of Canada' location. I'd be willing to bet that Bill Gray does indeed at least allow for this, but perhaps tweaking of input parameters would be involved. This would account for the tens of time-seconds difference Stan quotes, and which ought to be calculable to an arc-second or so for any instant (tens of time-sec is a huge error by comparison, so something is amiss). \Brian -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.