Fwd: Solar math

The attached mail from Frans Maes was erroneously sent to me only. I wish to add that the same "trick" can be done with Sol Et Umbra using the commands at the bottom of the display. Ciao. Gian -- Forwarded message -- From: Maes, F.W. Date: 2018-03-22 21:00

Re: Solar math

Dan, the program AlmSun by Rafał Tomasik can compute the instant when the sun reaches the desired azimuth and height. More info can be found at http://almsun.pl/en/ Actually it is not freeware but it requires a small payment (it was 19 $ two years ago). Ciao. Gian 2018-03-22 15:47 GMT+01:00

Re: Solar math

I don't know any software, but my approach would be: 1. Use Altitude and Azimuth and Latitude to calculate Declination (straightforwad Spherical Trig calculation. If you need formula, it will take me a moment to come up with it) 2. Calculate dates for the declination (longitude/time zone will

Solar math

Dear all, given the azimuth and altitude of a point in the sky, what would be the best way of finding the dates and times during which the Sun reaches that point? Is there any software for this? Dan Uza ---

Re: star-shaped sundial in Finland

Dear Fabio, There are several similar sundials in the Netherlands. One example can be seen at: http://www.fransmaes.nl/zonnewijzers/en/menkema-e.htm Typically, they are combined with two cubic sundials, rotated 45° with respect to another. The points of the star all form small polar dials, each

star-shaped sundial in Finland

Hi all I've a contact with Susanna Kuokkanen, a student of archeology of the University of Oulu, Finland. Oulu is quite close to the polar circle, on the gulf of Botnia. A star-shaped sundial was found during an axcavation for the construction of a building in Tornio. Tornio is just at the