Question: What if I don't know my time of birth, or I know it only approximately?
Answer:
The rule says that in order to conceive a child of a desired gender with high probability, the intercourse should take place in 24 hour period before the moment calculated by the Lunar Conception Calculator. This is true in the case when the future mother's birth time is known more or less precisely, within several minutes.
The less precise the birth time, the more is uncertainty in the rule. Say, if you know your birth time with precision plus-minus one hour then the Lunar Conception moment is also known with the precision of plus-minus one hour, and the period that is favorable for conception also becomes less certain. Let's consider an example.
A woman has calculated her Lunar Conception moments and one of them happens to be at 9:15 on the 21st of October. This would normally mean that she should have an intercourse in the period from 9:15 on the 20th of October to 9:15 on the 21st of October.
However, let's say that this woman knows her birth time with precision plus-minus one hour. This means that the real Lunar Conception moment can be somewhere in the interval from 8:15 to 10:15 on the 21st of October. Consequently, the period recommended for the intercourse starts in the interval from 8:15 to 10:15 on the 20th of October.
This is not a big deal, of course, she can just make sure that the intercourse takes place closer to the middle of the recommended period. So if there is some uncertainty in your time of birth, just make it as precise as possible when using the Calculator and then try to have the intercourse closer to the middle of the recommended period of 24 hours.
Many women don't know their birth time at all >In this case the advice is: enter 12pm (midday) in the calculator. Then the period of high fertility, when you should have an intercourse, will be from 36 hours before the calculated moment to 12 hours after it, but the probability of conception will be somewhat lower than for those who know their time of birth.
Having said that, the 24 hour rule is just a rule, and every rule can have exclusions. You might be fertile a few hours before the period specified by the rule and, who knows, perhaps a few hours after it. At the moment, we do not have enough information to prove or disprove this.
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