Re: CORRECTIONS & Extensions to "A few new Tables for the Gnomonist..."
If you look at the page source, Meeus is being using via a port to JavaScript. It's also mentioned in Note 4 in the page below: http://www.precisedirections.co.uk/Sundials/Solar_Position_Calculator.html I pretty much implemented the same thing only as a server side process, not a client side one. http://www.gcstudio.com/suncalc.html By the way, there can be issues with various browsers when running client side computations. http://stackoverflow.com/questions/9389315/cross-browser-javascript-number-precision Luke On 6/12/14, 12:18 PM, Bill Gottesman wrote: Well, you could include both ways. This is a really nice resource you have provided. Did you already say the reference for your high precision calculations? -Bill On Thu, Jun 12, 2014 at 1:12 PM, Kevin Karney mailto:kar...@me.com>> wrote: Dear Friends Thanks for the positive comments! And thanks to Gianni Ferrari, Patrick Powers, Edward French and Jack Aubert for pointing out the MAJOR error in the Annual Equation of Time Table. It was giving EoT values /across/ the table instead of /down/, which is an error I had corrected before - but had crept back in! That has been corrected Many apologies Also, by popular request, I have changed the sign of EoT from the strict astronomical convention to the more usual gnomonical convention (the correction to get from sundial to local mean time). Gianni also wants Azimuth measured from the South... I am a 0 deg at North person. Any thoughts ? I will probably change things to give a radio button, so you can choose. I have had requests for a solar noon table and solar east/west table and a half-minute Victorian table - which I shall implement in due course Best wishes Kevin --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: CORRECTIONS & Extensions to "A few new Tables for the Gnomonist..."
Thanks, Patrick That glitch has been fixed. Kevin On 12 Jun 2014, at 21:38, Patrick Powers wrote: > Hi Kevin, > Thanks for that change. An apparently similar problem seems to apply to the > ‘Victorian EoT’ table when Longitude is zero. There are then listed EoT > values of 23 and 24 mins in Jan and Feb. > > You asked for input re formats on azimuth. I think that just as with the > sign of the EoT there are conventions that grew up with gnomonics and > conventions that arose within astronomy and navigation. If what you are > providing is intended more as a resource for those interested in sundials > then maybe Gianni’s view should prevail? > I suspect your idea of a radio button for these would be the best option! > Regards > > Patrick > > From: Kevin Karney > Sent: Thursday, June 12, 2014 6:12 PM > To: Sundial > Subject: CORRECTIONS & Extensions to "A few new Tables for the Gnomonist..." > > Dear Friends > > Thanks for the positive comments! > And thanks to Gianni Ferrari, Patrick Powers, Edward French and Jack Aubert > for pointing out the MAJOR error in the Annual Equation of Time Table. > It was giving EoT values across the table instead of down, which is an error > I had corrected before - but had crept back in! > That has been corrected Many apologies > > Also, by popular request, I have changed the sign of EoT from the strict > astronomical convention to the more usual gnomonical convention (the > correction to get from sundial to local mean time). > > Gianni also wants Azimuth measured from the South... I am a 0 deg at North > person. Any thoughts ? I will probably change things to give a radio button, > so you can choose. > > I have had requests for a solar noon table and solar east/west table and a > half-minute Victorian table - which I shall implement in due course > > Best wishes > Kevin > > --- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > --- > https://lists.uni-koeln.de/mailman/listinfo/sundial > --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: CORRECTIONS & Extensions to "A few new Tables for the Gnomonist..."
Hi Kevin, Thanks for that change. An apparently similar problem seems to apply to the ‘Victorian EoT’ table when Longitude is zero. There are then listed EoT values of 23 and 24 mins in Jan and Feb. You asked for input re formats on azimuth. I think that just as with the sign of the EoT there are conventions that grew up with gnomonics and conventions that arose within astronomy and navigation. If what you are providing is intended more as a resource for those interested in sundials then maybe Gianni’s view should prevail? I suspect your idea of a radio button for these would be the best option! Regards Patrick From: Kevin Karney Sent: Thursday, June 12, 2014 6:12 PM To: Sundial Subject: CORRECTIONS & Extensions to "A few new Tables for the Gnomonist..." Dear Friends Thanks for the positive comments! And thanks to Gianni Ferrari, Patrick Powers, Edward French and Jack Aubert for pointing out the MAJOR error in the Annual Equation of Time Table. It was giving EoT values across the table instead of down, which is an error I had corrected before - but had crept back in! That has been corrected Many apologies Also, by popular request, I have changed the sign of EoT from the strict astronomical convention to the more usual gnomonical convention (the correction to get from sundial to local mean time). Gianni also wants Azimuth measured from the South... I am a 0 deg at North person. Any thoughts ? I will probably change things to give a radio button, so you can choose. I have had requests for a solar noon table and solar east/west table and a half-minute Victorian table - which I shall implement in due course Best wishes Kevin --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: CORRECTIONS & Extensions to "A few new Tables for the Gnomonist..."
Well, you could include both ways. This is a really nice resource you have provided. Did you already say the reference for your high precision calculations? -Bill On Thu, Jun 12, 2014 at 1:12 PM, Kevin Karney wrote: > Dear Friends > > Thanks for the positive comments! > And thanks to Gianni Ferrari, Patrick Powers, Edward French and Jack > Aubert for pointing out the MAJOR error in the Annual Equation of Time > Table. > It was giving EoT values *across* the table instead of *down*, which is > an error I had corrected before - but had crept back in! > That has been corrected Many apologies > > Also, by popular request, I have changed the sign of EoT from the strict > astronomical convention to the more usual gnomonical convention (the > correction to get from sundial to local mean time). > > Gianni also wants Azimuth measured from the South... I am a 0 deg at North > person. Any thoughts ? I will probably change things to give a radio > button, so you can choose. > > I have had requests for a solar noon table and solar east/west table and a > half-minute Victorian table - which I shall implement in due course > > Best wishes > Kevin > > --- > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: CORRECTIONS & Extensions to "A few new Tables for the Gnomonist..."
I also write astronomical algorithms and astronomical software. And I also use Meeus for my inspiration. Meeus, though an astronomer, also recommends measuring from South, but I have decided over several astronomical products to continue measuring from North, which more laymen are familiar with. products to ,On 2014-06-12 13:12, Kevin Karney wrote: Dear Friends Thanks for the positive comments! And thanks to Gianni Ferrari, Patrick Powers, Edward French and Jack Aubert for pointing out the MAJOR error in the Annual Equation of Time Table. It was giving EoT values /across/ the table instead of /down/, which is an error I had corrected before - but had crept back in! That has been corrected Many apologies Also, by popular request, I have changed the sign of EoT from the strict astronomical convention to the more usual gnomonical convention (the correction to get from sundial to local mean time). Gianni also wants Azimuth measured from the South... I am a 0 deg at North person. Any thoughts ? I will probably change things to give a radio button, so you can choose. I have had requests for a solar noon table and solar east/west table and a half-minute Victorian table - which I shall implement in due course Best wishes Kevin --- https://lists.uni-koeln.de/mailman/listinfo/sundial -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: CORRECTIONS & Extensions to "A few new Tables for the Gnomonist..."
Dear Kevin, You note: > I am a 0 deg at North person. > Any thoughts? So am I! That said, this is a bit like being a big-ender or a little-ender when it comes to eating eggs! Frank --- https://lists.uni-koeln.de/mailman/listinfo/sundial
CORRECTIONS & Extensions to "A few new Tables for the Gnomonist..."
Dear Friends Thanks for the positive comments! And thanks to Gianni Ferrari, Patrick Powers, Edward French and Jack Aubert for pointing out the MAJOR error in the Annual Equation of Time Table. It was giving EoT values across the table instead of down, which is an error I had corrected before - but had crept back in! That has been corrected Many apologies Also, by popular request, I have changed the sign of EoT from the strict astronomical convention to the more usual gnomonical convention (the correction to get from sundial to local mean time). Gianni also wants Azimuth measured from the South... I am a 0 deg at North person. Any thoughts ? I will probably change things to give a radio button, so you can choose. I have had requests for a solar noon table and solar east/west table and a half-minute Victorian table - which I shall implement in due course Best wishes Kevin --- https://lists.uni-koeln.de/mailman/listinfo/sundial
