What is a grand sextile in astrology?

A very rare aspect figure in which six planets are situated at angles of 60 degrees - in other words a sextile - to each other and form a hexagram. The planets are usually situated in signs whose elements complement each other, such as Fire and Air or Water and Earth.

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How rare is a stellium?

It's not very rare. It just is a focused concentration of the same zodiac sign's energy in whatever house the stellium is in. Or the stellium could be in two zodiac signs and houses, depending on what degrees of the signs the planets are in. Does Lilith count in a stellium? No. Personally, I only count the planets in a related sign. At least 3 planets in a sign are needed in order to talk about a stellium.

Thereof, how does a stellium affect you?

A stellium affects our personality by making certain qualities, characteristics, and themes in your life more apparent than others. It makes your personality a lot stronger. In fact, a stellium is so powerful that it can potentially reduce the strength of your sun sign - if it's not in your stellium. How do you know if you have a stellium? If you have three or more planets nestled in one house, you have a stellium. Then, see if you have three or more planets in a particular zodiac sign. That's a stellium, too!

Subsequently, what are my 3 big signs?

Your big three refers to your sun, moon, and rising (or ascendant) placements on your natal chart. Your natal chart is where the planets, moon, and sun were aligned in the sky at the time, date, and location of your birth. What are Big 3? The first step to getting to know your horoscope is to find out what your "big three" placements are ? the sun, the moon and the ascendant. These three planets describe different parts of you, and together they form a very truthful picture of your personality.