Steve-- What was the solar declination when the dial's time-reading and the clock-time had the values that you described?
Of, alternatively, what was the date? Michael Ossipoff On Fri, Sep 28, 2018 at 1:25 PM Steve Lelievre < steve.lelievre.can...@gmail.com> wrote: > Michael, > > Thanks for your replies. > > > On 2018-09-27 8:50 PM, Michael Ossipoff wrote: > > I'll fill in those topics*, describing the derivation in more detail, > > in postings here, if you'd like [ ... snipped ...] > > > > *for the problem of finding how azimuth-misaligned the dial must be, > > to have a given wrong time-reading, at a given local true solar time > > and solar declination. > > I'll take a rain check on that, if I may. I have received explanations > (off list) from Brian Albinson and Hank De Wit which I want to finish > studying before asking for more help. > > > By the way, I should add that of course all that's necessary is that > > the dial be azimuth-rotated so that it tells the time that it should > > tell, and so it isn't necessary to solve the problem that we're > > talking about in order to azimuth-align the dial. > > Yes, of course - but I'm not going to be correcting the dial myself. I > will tell the parks department what I think is wrong and I want to > provide nice simple guidance to help them decide if they want to do > anything about it. Saying something like "Twist the dial about the > vertical, so that rod in the middle is on a north-south line with the > upper end pointing towards the north pole. The line has to be true > north-south not magnetic north-south. You'll need to move it by 7.5 > degrees" is more likely to get action than a procedure that requires > them to obtain and work with local solar time (extra hard for a dial > that only shows hours and half hours, and for a job that likely wouldn't > be carried out at a specific date and time). > > Steve > > >
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