Astro-calculator is designed for astronomical and astrological calculations and conversions related to various coordinate systems. First of all, it can be useful to traditional astrologers.

The top row of the calculator shows the data of the current dial. They will be used in calculations. The area located under the "Arguments" checkbox is used to enter the initial values. If there is a check mark, then these are the values of the ecliptic coordinates, if not, the equatorial coordinates. The pole of the signifier will need to be entered if certain calculations need to be carried out for the system of Regionomontanus houses (more on that later).

Below is the geographic latitude and right ascension MС (RAMC) corresponding to the current data.

Let's say you have set arguments for the longitude and latitude of a certain point. You can immediately see the following calculated parameters:

- In which quadrant is this point
- Its right ascension and declination (in the case of equatorial arguments, these will be longitude and latitude)
- Oblique ascent and descent
- Difference of ascents
- Upper and lower meridian distance
- Day and night half-arc
- Day and night seasonal hour;
- Hourly distance;
- Mundane position in the Placid system
- It is also determined whether a given point is in Kazimi. The orb for Kazimi is determined by the corresponding settings – Settings/Basic preferences/Aphetic calculations/Distances from the Sun. There you can also choose whether to take latitude into account in the calculations;

It is also possible to calculate the point of the ecliptic by straight ascent, oblique ascent or oblique descent. This is done in a separate area of the window at the bottom left.

For those who use the Regionomontanus system, the following are also calculated:

- Zenith distance
- The difference of ascents under its own pole
- Pole
- Inclined ascent (walking) under its own pole
- Inclined ascent (walking) under the signifier pole. In this case, it is necessary to define the pole of the signifier in the arguments;

By clicking on the "Cusps" we open the table of house dials by Regionomontanus.

Here we see for each cusp the value of the pole and the inclined ascent (descent) under its own pole.

Those columns that are indicated with brackets "(-5)" indicate the same values, but for shifted positions of house dials by -5 mundane degrees. This is useful when we want to determine exactly whether to count an object in front of the cusp in the next house or not according to the rule of 5 degrees, but taking into account spherical geometry.

If you want to set arguments for an object already present on the chart, just click on it with the left mouse button. In this case, its coordinates will be automatically substituted into the arguments, and all parameters will be recalculated.

If some abbreviations are not clear to you, you can hover the mouse cursor over these values, and a corresponding hint will pop up.

How to use it. Let's take this chart as an example (04.04.1972 22:00 Moscow):

Consider Venus, located in front of cusp 8 at home in the Regionomontanus system. We see that between Venus and the cusp 8 houses 6 degrees 35 minutes (look at the aspects table). But we need to determine whether Venus is in the 7th house or already in the 8th according to the rule of 5 degrees. Moreover, these degrees should be mundane. To do this, we need to compare the mundane position of Venus with the mundane position of the house dial corresponding to the eighth house dial, but shifted by 5 mundane degrees.

Now we click on Venus, and its coordinates are automatically substituted in the arguments. Immediately, all the calculator data was updated. We look at the table of house dials, the pole of the shifted eighth house dial is 53 degrees 5 minutes, and now we drive this value into the cell "Pole of the signifier". Press "Enter", and we see the desired value of the inclined approach under the pole of the signifier 93 degrees 9 minutes. It remains only to compare it with the corresponding value of the house dial from the table. The oblique setting of the shifted eighth house dial is 90 degrees 48 minutes. And this means that Venus has crossed the mundane position of the shifted 8 house dial, and in this case we can say that it already belongs to the 8th house.

To remove the cusp table, click on "Cusps" again.