is has now been posted on www.solar-noon.com There are two areas where further improvement may be possible, and I would welcome the views of others.
1. We have used the average values as in Waugh (and repeated in many other places). (You can get a printout of these values by setting the longitude to zero.) Average values are good enough for the Spot- On Sundial, for which this calculator was designed, and have the practical advantage that the table can be kept next to the sundial without reprinting it each year. But it would be better to provide more accurate values if this can be done without too much additional complication. Question: would it be useful to the wider sundial community to have a facility for calculations on the actual values for this year? Would it be useful to anybody to have the whole year's figures on one sheet for just this one year (and have to print out another one next year). 2. If we do use an average, are the Waugh figures the best ones to use. We had previously checked them against the arithmetic average of the NASS Diallist results for the first of each month over the 4-year cycle, and there are differences ranging from 2 to 20 seconds. I am no astronomer, and so really do not know what can or should be done about this. Question: Can anyone suggest a better set of averages, or way of calculating them? Comments gratefully received, and again many thanks for all the comments on the original posting. Piers Nicholson
