Mario Arnaldi wrote: > > >Dear Frank, > > > >Indeed, the astrological houses are the same as the Domifying Circles. > > > >These houses however aren't equal to the zodiacal signs so I don't agree > >with your sentence : > >'indicate the first point of entry of the sun into the respective signs > >of the zodiac' > >To indicate in what zodiacal sign the sun is you have to use declination > >lines or date lines. > > > >There are more than one definition for the astrological houses but the > >most common seems to be the system of Regiomontanus by which the > >equatorial plane is divided in 30 degrees. > >North-south directed planes intersecting these points are the borders of > >the 12 houses. > >At latiude 0 degrees these planes lie 15 degrees apart but at other > >latitudes the angles between the planes aren't equal. > ------------------- > > Dear Mr. De Vries, > > Although I'm not an astrologer, I partially don't agree with your > sentence. I mean yes it is right that Regiomontanus considers the equatorial > plane the origin of the division of the twelve houses, but it is not the > only one theory, as you wrote. Surely this was the most renowned, though > nowadays there is one other commonly accepted. > By the way in medieval times there were many theories about it. One of the > most common was the one by Campanus from Novara, that used the first > vertical as origin and divided it in twelve. > > Nevertheless, there is a system, mostly used up to nowadays in England that > is called, "ecliptic houses" or "zenital" that, I think, divide the > ecliptical circle. > I don't know for sure if the "domus planetarum" (the planet's houses) are > the same as the astrological houses, but the houses of the planet was, in > ancient past, exactly the zodiacal sign, and this is testified in many > medieval books. > > Am I wrong? > If yes, I will be delighted to know more from you, or some other. > > Happy dialling > > Mario > --------------------------------------------------------- > Mario Arnaldi > Viale Leonardo, 82 > 48020 LIDO ADRIANO - Ravenna > Italy > E-Mail [EMAIL PROTECTED] > ---------------------------------------------------------
Dear Mario, For astrological houses I do know the system of Campanus, deviding the prime vertical into 12 parts. And Regimontanus devided the equatorial plane into 12 parts. Both systems use 6 great circles passing through the north and south point in the horizontal plane at the given location and the mentioned points on the prime vertical ( Campanus ) or equatorial plane ( Regiomontanus ). The projection of these 6 great circles on the sundial gives the wanted lines for the houses. These circles are steady circles and can be used on sundials. I also do know ( a little ) of houses using 6 great circles passing through the ecliptical poles and deviding the ecliptic in 12 parts. However this is not a steady system and projection on a sundial gives the lines for only one day. This system is much older than the systems by Campanus and Regiomontanus but is useless on sundials. More systems will have been used I assume but on sundials I only am aware of the system by Regiomontanus. I haven't any idea why people use or did use the houses, but it is interesting to know their appearance on dials. Fer.
