Rules and Tips

A number of people had complained about the accuracy of the Chinese Gender Chart. They, however, do not know that they had been putting the wrong data on the chart. In order to get a high successful rate in gender selection or prediction, you must know the right ways to use the chart. By following these guidelines, you will get the best out of the chart.

(1) Chinese Gender Chart is based on Lunar Calendar

Lunar Calendar

As the CGC was invented in ancient China, it is not surprising that both age and month required by the chart should be calculated from the Chinese lunar calendar. There are some people argue that Gregorian (western) calendar should be used. Think about the chart has several hundreds years of history, and the Gregorian calendar was not adopted by China till early 20th century, therefore the argument is simply not valid.

What is Lunar Calendar?
A lunar calendar (aka Chinese calendar) is actually a calendar whose date indicates the moon phase. Lunar months are determined by the period required for the moon to complete its full phasic cycle of 29 and a half days, a standard that makes the lunar year a full 11 days shorter than its solar counterpart. This difference is made up every 19 years by the addition of seven lunar months, which is called leap month. For more detail about the Chinese Lunar Calendar, please click.



How to convert Gregorian Calendar to Chinese Lunar Calendar?
The easiest way for Gregorian-Lunar conversion is using the Gregorian-Lunar converter (for Internet Explorer only). If you want to do it manually, you can use the Gregorian-Lunar Calendar Conversion Tables, provided by Hong Kong Sky Observatory.

a. What is the lunar date of Gregorian April 4, 1990?

Click on the year 1990 in the above table, and you can easily find out the corresponding lunar date is Day 9 of the 3rd Lunar Month.

b. What is the lunar date of Gregorian June 10, 1967?

Click on the year 1967 in the above table, and you can easily find out the corresponding lunar date is Day 3 of the 5th Lunar Month.

c. What is the lunar date of Gregorian February 2, 1988?

Click on the year 1988 in the above table, and you can find out the corresponding lunar date is Day 15 of the 12th Lunar Month of the previous lunar year. (Note: January 1st to February 16th of 1988 is considered as part of the previous lunar year. )

What is the rationale behind lunar calendar on gender prediction?

No one knows exactly how the ancient Chinese could develop such highly accurate baby birth chart. But many people believe that the chart was created by utilizing the I Ching plus decade-long statistics.

In western countries, the effect of lunar month and mother's birth date on gender selection has not been carefully studied until 1950s, when Dr Eugen Jonas, a Czechoslovakian gynecologist, set up a fertility clinic and carried out scientifically controlled tests on thousands of women using this astrological method. His tests resulted in a consistent 98% accuracy. Dr. Jonas' method includes a belief that

Although his theories can not really explain the rationale behind this ancient birth chart, he did mention that gender selection is related to woman's birth and lunar cycle.

For more about Jonas method, please visit

   - Dr Jonas method

Rules and Tips of using the CGC 1. The chart is based on lunar calendar 2. A new born baby is one year old 3. Choose to conceive in the middle of a gender period 4. Don't choose to be conceived on leap months

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