Ultimate Edition

The World of Jyotish
Vedic Astrology of Maharshi Parashara

True Chitrapaksha Lahiri Ayanamsha

All calculations of Version 5.5 are based on the True Chitrapaksha Lahiri Ayanamsha. In contrast to the official Lahiri Ayanamsha, the true Chitrapaksha Ayanamsha calculates the star Chitra (Spica) exactly on 180° - i.e. opposite of 0° Mesha (Aries), the starting point of the Zodiac.

Mid of 1950 the Calendar Reform Committee under the leadership of Lahiri determined the official Lahiri Ayanamsha. Lahiri wanted Chitra to be placed exactly on 180° in the Zodiac, as derived from the traditional reference book Grahalaghava, which was published in the 16th century. However, the formula of calculation in this publication was not so precise.

Therefore in 1967, i.e. 12 years after the official Ayanamsha was set by the Calendar Reform Committees, Lahiri corrected it in his own Almanac - by calculating Chitra’s position exactly for 180 degrees by using the modern means of calculation. However, this correction was not adopted in the official Lahiri Ayanamsha.

We are grateful that Swiss Ephemeris is offering now this True Chitrapaksha Ayanamsha and we have adopted it for the calculations in the APA UA 5.5.

The difference between True Chitrapaksha Ayanamsha and the official Lahiri Ayanamsha varies from 30“to 60“. This time span arises because Chitra (Spica) changes its position in an irregular way. This is because of Chita’s own movement plus a slow change of orientation of the ecliptic.

Since the moon takes about 1 to 2 minutes to move through 30 to 60 seconds of arc, significant changes arise in the Dasha calculation (up to 12 days). Also minor changes in the Lagna degree (up to 6”) arrise.

Chitra is the central star of Chitra Nakshatra. It is described as glowing and unique jewel or pearl. Its Devata is Vishvakarman, the divine architect of the universe, who created something unique and impressing of dazzling beauty. On the level of physiology Chitra is associated with the navel. Through the navel a human being is structured and nourished in the mother’s womb.

Like this Chitra is considered to be the navel of the universe from which the Kalapurusha (Zodiac) emerges. So, Chitra must be located exactly in the middle of the Kalapurusha (Zodiac) at 180°.

Extensive research by Siebelt Meyer has shown that the results of True Chitrapaksha Lahiri Ayanamsha are significantly more accurate as compared to the official Lahiri Ayanamsha.

Therefore, based on the above points APA UE Version 5.5 supports only calculations done with True Chitrapaksha Lahiri Ayanamsha. Names of individuals in the APA database whose Kundalis are calculated with True Chitrapaksha are marked with * following the last name.

For comparison purposes it is possible to run the previous UPA UE 5.3 (Lahiri old) simultaneously with the new version APA UE 5.5. After installation the APA UE 5.5 will be saved as „APA Ultimate Edition 55“ and the new icon will show a red border around the regular blue APA logo.

If you want to change individuals’ data you can do this in both versions. However, since each of the two APA UE versions use a different data base, data changes in one version cannot be synchronized with the other version. Therefore we recommend to do data changes in version 5.5 only.

Version 5.3 (Official Lahiri Ayanamsha) and Version 5.5 (True Chitrapaksha Lahiri Ayanamsha)
can be operated at the same time on your computer.



After installing 5.5.x all data from your previous APA-UE version will be copied from your previous APA-UE version. If you want to use these birth data, please study following points carefully:

1. New Entry of Data
In version 5.5.new entrys of birth data will be marked with * after the last name. This indicates that the Kundali has been calculated with True Chitrapaksha Lahiri Ayanamsha. Like this you can differentiate between Kundalis calculated with True Chitrapaksha Lahiri Ayanamsha and those which were transfered from your previous APA-UE version.

If you have entered birth data which you want to modify, remove the * from the last name by

--> clicking the option "Edit current person" in the List of Persons. Then
--> remove the * from the last name,

--> close the window and follow the procedure as detailed in point 2 below.

2. Data from List of Persons NOT marked with *:
• transferred from APA-UE 5.3 x or earlier version,
• transferred from APAS or
• new Entry where the * was removed.

When opening such birth data, you will be asked how you want the Kundali to be calculated.

You may choose between three options:
1. Lagna-Degree should be maintained.
2. Dasha-Begin should be maintained.
3. Birthtime should not change.

to 1: Choose this option, when you are very sure about the Lagna-Degree.

to 2: Mostly this option will be applicable, since you may want to keep the dasha-begin for the kundali of consideration- especially after a profound birth time rectification.

to 3: This option is advisable if you are very sure that the given birth time is precise i.e. wittness of birth took exact time etc. As compared to previous APA-versions this will result in a minor change of the lagna-degree and a distinct change of the dasha begin.