A brief summary of main points of astrology, Earth & Solar

Solar System

Celestial sphere, ecliptic, vernal equinox

占星學的四大要點

太陽系

天球、黃道、春分點

• Constellations (Basic Archetypes)
 Constellations represent directions in the universe, and also represent twelve basic personalities and ways of expression. When each person is born, the sun is in a different constellation, which affects personality and destiny.

• House (Life Circumstances) Houses represent different areas of life, such as family, career, etc. Each house corresponds to a part of life, explaining in which areas we will have special experiences.

• Planet (force) 
Planets refer to the planets in the solar system that are related to the earth, such as the sun, moon, Mercury, Venus, etc. These planets affect people's personality and living conditions.

• Aspect (good or bad)
 Phase refers to the angle between two planets in the sky. Different angles (such as 0Degree, 180Degree, 120Degree, 90Degree. Some will be auspicious, while others will bring challenges.

• 星座（基本原型）
星座代表宇宙中的方向，也代表十二種基本性格和表現方式。每個人出生時，太陽在不同星座，這會影響個性和命運。

• 宮位（人生場境) 宮位代表人生的不同領域，例如家庭、事業等。每個宮位對應人生某一部分，說明我們在哪些方面會有特別的經歷。

• 行星（作用力）
行星指太陽系中與地球有關的星球，如太陽、月亮、水星、金星等。這些行星會影響人的性格和生活狀態。

• 相位（吉凶）
相位是指兩顆行星在天空中的夾角。不同的角度（如0度、180度、120度、90度）會帶來不同的影響，有的吉利，有的帶來挑戰。

The Earth we live on is a beautiful planet in the solar system. The solar system consists of the sun and other celestial bodies orbiting the sun, including the satellite moon that has a profound tidal effect on the earth, and the neighboring inner planets—Mercury and Venus; the three visible outer planets—Mars, Jupiter and Saturn, as well as the three more distant outer planets Uranus, Neptune and Pluto, plus the planets' own satellites and countless asteroids and comets.

The solar system is like a big disk in space. The orbits of the planets are elliptical. The planets orbit the sun in the same direction but at different speeds. Therefore, when we observe from the earth, we will see that the planets sometimes move forward and sometimes move backward. The moon is the satellite of the earth, and it orbits the earth.

When we observe the sky with the Earth as the center, we can imagine that the sky is a huge crystal ball, called the "celestial sphere". The stars on the celestial sphere are fixed, while the sun, moon and planets move on the celestial sphere. By projecting the constellations and orbits on the celestial sphere onto the Earth, we can know the paths of celestial bodies.

1.Celestial Sphere

The celestial sphere is an imaginary sphere that extends infinitely outward with the Earth at its center.

The positions of the stars on the celestial sphere are fixed, while the sun, moon and planets move on the celestial sphere.

When we observe the motion of celestial bodies, we usually assume that they are all moving on the surface of the celestial sphere.

2.Zodiac

The ecliptic is the path of the sun on the celestial sphere.

The Earth's rotation axis is tilted about 23.5degrees, so the ecliptic intersects the celestial equator at two points, namely the vernal equinox and the autumnal equinox.

The ecliptic divides the year into twelve constellation areas, which are the twelve zodiac signs.

3.Spring Equinox

The vernal equinox is one of the points where the ecliptic intersects the celestial equator.

When the sun reaches the vernal equinox, day and night are almost equal.

The vernal equinox is the starting point for calculating ecliptic longitude in astronomy.

我們所居住的地球是位於太陽系的一顆美麗行星。太陽系是由太陽及其他環繞太陽的天體所組成，這些星體包括對地球潮汐影響深厚的衛星月球，鄰近的內行星—水星與金星；三個可見的外行星—火星、木星與土星，以及三個更遠的外行星有天王星、海王星與冥王星，再加上行星本身的衛星及無法計算的小行星及彗星。

太陽系在太空中就像是個大圓盤一樣，行星的軌道是橢圓形的，行星繞着太陽與相同的方向，不同的速率繞着太陽運行。因此當我們從地球上觀察時，就會看到行星有時會前進、有時會後退。而月亮是地球的衛星，它是繞着地球運轉。

當我們以地球為中心來觀察天空時，可以想像天空是一個巨大的水晶球，稱為「天球」。天球上的恆星固定不動，而太陽、月亮和行星則在天球上運行。將天球上的星座和軌道投影到地球上，便可得知天體的運行路徑。

1. 天球

天球是一個假想的球體，以地球為中心，向外無限延伸。天球上的恆星位置固定，太陽、月亮和行星則在天球上移動。我們觀察天體的運動時，通常假設它們都在天球表面上運行。

2. 黃道

黃道是太陽在天球上運行的軌道。地球自轉軸與黃道面傾斜約23.5度，因此黃道與天赤道交於兩點，分別是春分點和秋分點。黃道將一年分為十二個星座區域，這些區域即為黃道十二宮。

3. 春分點

春分點是黃道與天赤道交點之一。當太陽運行至春分點時，晝夜幾乎相等。春分點是天文學上計算黃道經度的起點。