How to set the Ayanamsha in Janus
and how to create a custom one

by Hank Friedman

In Vedic astrology, and in Western Sidereal astrology, practitioners use the Sidereal Zodiac instead of the Tropical Zodiac. (Note: The Sidereal Zodiac uses the constellations in the sky to define the 12 signs, instead of the Four Seasons - Spring, Summer, Fall, and Winter - used by the Tropical Zodiac.)

The way to switch to using the Sidereal Zodiac in astrology programs is to choose a default Ayanamsha (specifying the beginning of the Zodiac). The reason that there are many different Ayanamshas to choose from is that there is no star in the sky at zero degrees of Aries, so astrologers have come up with a variety of starting points for the stellar Zodiac. Most Jyotishis use Lahiri ayanamsha.

The Sidereal Zodiac for all calculations in Janus

If you want to use the Sidereal Zodiac for everything in Janus, and want use an Ayanamsha already built into the program, please follow these two steps:

1. From the Settings menu, click on General:

General under Settings menu

2. Then on the General Settings screen that appears, click Next twice to get to this screen:

General Settings screen

and choose the Zodiac System you prefer (I recommend Lahiri for Vedic work) and then keep clicking on Next until you reach the final screen and then click on Finish.

If you decide to return to using the Tropical Zodiac throughout Janus, follow the same steps and choose Tropical.


The Sidereal Zodiac for Vedic Charts and calculations in Janus

If you want to use the Sidereal Zodiac just for Vedic work in Janus, and want use an Ayanamsha already built into the program, follow these steps:

A. Under Chart, click on Vedic Chart:

Vedic chart

B. Click on Settings at the top of the Vedic Chart screen:

Settings for Vedic work

C. Click on the Options tab on the screen that appears:

Vedic options screen

And select the Zodiac System that you want (again I recommend Lahiri).


Creating a Custom Ayanamsha

Why would an astrologer want to create their own custom Ayanamsha? There are many reasons, but, for example:

When Lahiri first published his Ayanamsha, there was a small miscalculation, so now many astrologers including myself use the corrected True Chitrapaksha Ayanamsha for Vedic work.

In order to use this in Janus, one has to create a Custom Ayanamsha.

Here are the steps:

First, click on the Settings tab and choose Custom Sidereal Zodiac:

Custom Sidereal Zodiac in Settings menu

Next, follow the steps depicted in this image to create your own Custom Ayanamsha:

setting a Custom Ayanamsha

1. Enter a name for your Ayanamsha

2. Enter the date you want to use as its reference point

3. Enter the degrees and minutes and seconds for that date

4. Click on the gray box at the left of Copy Ayanamsha to left hand panel

5. Click on the Save Changes button.

You can then choose this Ayanamsha for either all of your work in Janus or just your Vedic work, using the steps outlined at the beginning of this article.

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