Danh sách hành tinh Hệ Mặt Trời

Astronomical symbols for the Sun, the planets (first symbol for Uranus), and the Moon, as well as the first symbol for Pluto were taken from NASA Solar System Exploration.^[57] The other symbols are even rarer in modern astronomy.

• The symbol for Ceres was taken from material published by James L. Hilton; it was used astronomically when Ceres was thought to be a major planet, and continues to be used today in astrology.^[58]
• The second symbol for Uranus was also taken from there; it is more common in astrology than the first symbol.^[58]
• The symbols for Haumea, Makemake, and Eris appear in a NASA JPL infographic, as does the second symbol for Pluto; they are otherwise mostly astrological symbols.^[59]
• The symbols for Quaoar, Sedna, Orcus, and Gonggong were taken from the astrology progam Astrolog; so far they have only been used in astrology.^[60]

The Moon is the only natural satellite with a standard symbol. Symbols have been proposed for the other natural satellites on this list, but have yet to receive widespread adoption amongst astronomers or astrologers.

${\textstyle 2\pi \left(c^{2}+b{\sqrt {a^{2}-c^{2}}}E(\alpha ,m)+{\frac {bc^{2}}{\sqrt {a^{2}-c^{2}}}}F(\alpha ,m)\right),}$ where ${\textstyle \alpha =\arccos \left({\frac {c}{a}}\right)}$ is the modular angle, or angular eccentricity; ${\textstyle m={\frac {b^{2}-c^{2}}{b^{2}\sin(\alpha )^{2}}}}$ and ${\textstyle F(\alpha ,m)}$ , ${\textstyle E(\alpha ,m)}$ are the incomplete elliptic integrals of the first and second kind, respectively. The values 980 km, 759 km, and 498 km were used for a, b, and c respectively.