## Constants

Date

Abstract

Thorn to provide macros for commonly used constants like the speed of light, the gravitational constant or the solar mass.

Because the number of deﬁnes could grow, I deﬁne some naming conventions:

• Afterwards a typical name is following.
• A _ is coming next.
• Either SI, cgi or C (for Cactus) is the last part. This speciﬁes the system of units used here (SI, cgi or Cactus units).

### 2 Provided Constants

• $c$ : the speed of light
• $G$ : the gravitational constant
• ${M}_{\odot }$ : the solar mass

Implements:

constants