I added a description of the Regiomontanus housesystem to the Houses project. Regiomontanus was for a long period a popular system and it certainly is worth the effort to study it.
At RadixPro you will now find how to calculate the ascendant. Coming texts will be mainly about house systems. I intend to publish descriptions and formulas about as many house systems as possible. More coming soon.
The Medium Coeli or MC is a point that is relatively easy to calculate. It is the same for all geographic latitudes and the formula is easy.
You can give it a try at the new page: Medium Coeli
Calculating sidereal time used to be an important part of calculating a chart. Without sidereal time there were no houses, no MC, no ascendant. For the calculation of sidereal time you will find the formulas at RadixPro. The formulas are simple and do not use any goniometry, so nothing stands in the way to give it a try with your own chart. Sidereal time
In astrology we use declinations since the very start of horoscopy. Not just for parallel aspects but also for more sophisticated systems like the one defined by Kt Boehrer. Even in archaeo-astronomy you will need declinations to define the position of a planet at the horizon. At RadixPro you will now find formulas to calculate the declinations yourself: Declinations
For almost all calculations you need to know the value of the angle between equator and ecliptic. That angle is relatively constant but over longer periods of time the value does change. You can handle these changes now: at RadixPro you will find formulas for the calculation of Epsilon as this angle is called by astronomers.
Time is a basic factor in all astrological calculations. In the formula section ou will find a description of the formulas: Factor t and delta T
Astronomy and mathematics, it is not everybody’s hobby. But you do need it if you want to practice astrology. In most cases the computer will handle these kind of tough jobs. But maybe you want more insight or you want to program yourself. Then it is necessary to understand more of the technical stuff.
At RadixPro I will publish formulas at a regular base. My ultimate goal is to cover all important calculations. For now I created a simple start: Astronomical formula for astrologers