Place and Time of Birth
Because the Sun, Moon, planets, and primary angles in the sky are constantly in motion relative to the earth, as each second passes the natal chart/astrological chart is changing (albeit slowly) and a new chart is created for every moment at each location. A natal chart is extremely personal and unique, depending on the specific date, exact time, and precise location of the birth. Even the birth charts of twins are often slightly different because one of the twins is usually born a few minutes apart from the other (see also: astro-twin).
The time of birth can usually be found on the birth certificate in many countries. In some instances, however, the birth times are rounded off by the nurse or doctor that is present to the nearest half or quarter-hour, thus rendering the time only approximately correct. Because of this fairly common practice, the parents should always remember to note the exact time of the child's first breath and not rely on the time given on the birth certificate in the event that they ever plan on having a precisely accurate natal chart calculated for their child. An accurate time of birth is virtually useless if the exact location of birth is not known.
Most charts are geocentric, that is based on the Earth. However, there is no reason in theory why a chart cannot be created for another planet. Some astrologers use Heliocentric - Sun centered - charts. These are theoretical constructions and have a different interpretation to geocentric natal charts. Charts based on other planets would need all the points recalculating from that point of view; for example, "Jovocentric" would be a Jupiter centered view.
Read more about this topic: Natal Chart
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