Alex wrote: !While on a search for something else, I began noticing that values for the declination of the sun seem to vary a great deal
In using a date of September 1st you are in a period of the year when the declination of the sun is changing by about 21 or 22 arcminutes per day so the time chosen on the days in question is important.. Also because of the leap year cycle there will typically be a 5 arcminute change from year to year at that time of year so any one quoted figure that makes no mention of the year will also not reflect the instantaneous figure. I suspect that the majority of the differences that you are seeing are connected with estimates made for different times of day or are ones using averages over four years - or both!. If you are looking for higher accuracy then I'd choose a calculator that permits input of both date and time. Regards Patrick --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
