南半球的問題，專業的占星命盤繪製公司Astrodienst說了，把原命盤做左右鏡像，其他都不用改變(氣候歸氣候，黃道歸黃道，月令就是黃道)。請參考一下在他們的網站的文章：
要注意的是赤道地區的南北半球劃分不是依赤道，是依太陽在天空中的位置決定。

有人會說，八字和黃道有關係嗎? 如果學習過大六壬的，就知道這兩者之間的關係了。簡單講，就是天道與地道，左旋與右旋的問題。

Horoscopes of the southern hemisphere
If one lives in the northern hemisphere and observes the planets, one will usually face towards south, because the Sun and the MC (the culminating degree of the zodiac) are always found in southern direction. Also, the planets are mostly found in the southern half of the sky. The observer may turn to east or west at times, but never to the north.

On the other hand, if one lives in the southern hemisphere and observes the planet, the situation is reverse. The sun always culminates in northern direction, the MC is in the north, and the planets are mostly seen in the northern half of the sky. The observer will therefore usually face towards north and practically never towards south.

For inhabitants of the southern hemisphere, the sun also rises in the east, but it will move over the sky from the right to the left. Also, it is obvious that the ascendant is usually found on the right hand side of the observer, not on the left hand side as is the case in the northern hemisphere.

Furthermore, the zodiac runs in reverse direction, namely in clockwise direction and the zodiacal constellations are seen mirror-inverted.

In contrast with these facts, even Australian, South African, and South American astrologers draw their birth charts in such a way that the ascendant is seen on the left side of the circle, the zodiac signs run in counter-clockwise direction, and no difference can be seen between a northern and a southern birth chart. Thus, southern horoscopes are usually mirror-inverted and therefore not in agreement with visual perception. The ascendant would have to be drawn on the right side, and the zodiac signs would have to be shown in clockwise direction.

The problem can be avoided however, if the observer lies on the ground having the head to the north and the feet to the south. Then the perspective would be roughly the same for inhabitants of both hemispheres. Current natal charts would then even be "correct" for the southern hemisphere.

For births in tropical regions, i. e. between the tropics of Cancer and Capricorn or between the geographic latitudes 23°26S and 23°26N, the situation is a bit ambiguous or depends on the hour. The midday sun is found in northern direction for part of the year, and in southern direction for the other part. And the MC is in northern direction for some hours and in southern direction for the rest of the day.

Since the seasons of the year are opposed to each other in the two hemispheres, some astrologers raised the question whether the zodiac signs should not be reversed, too, in birth charts of the southern hemisphere. E. g. some believe that a person born in March or April, thus in southern autumn, should not rather be considered a Libra than an Aries. As a matter of fact, however, Australian, South African and South American astrologers reject this idea. They are of the opinion that the same zodiac signs must be used for all geographic regions.