Specification for Celestial Information

1. Overview

1. Functions

CelestialInformation manages the celestial bodies position and velocity on the inertial frame.
This class also manages the celestial body information like the gravity constant, the radius, and the rotation.
The actual calculations are executed by CSPICE or EarthRotation, and this class just calls their functions.

2. Related files

src/environment/global/celestial_information.cpp, .hpp
- CelestialInformation class is defined.
src/environment/global/global_environment.cpp, .hpp
- CelestialInformation class is used here as a member variable of GlobalEnvironment class.

3. How to use

Call UpdateAllObjectsInformation function to calculates the celestial bodies position and velocity.
Users can get calculated values by using the following functions:
- GetPositionFromCenter_i_m
  - You can select celestial ID or name for the arguments
- GetVelocityFromCenter_i_m_s
  - You can select celestial ID or name for the arguments
- GetGravityConstant_m3_s2
  - argument is celestial body name
- GetCenterBodyGravityConstant_m3_s2
- GetRadii_m or GetRadiiFromName_m
  - You can select celestial ID or name for the arguments
- GetMeanRadiusFromName_m
  - argument is celestial body name

3. Explanation of Algorithm

1. `UpdateAllObjectsInformation` function

1. overview

Actual calculation is executed by the CSPICE library. This function just calls the CSPICE functions.

4. Verification

NA

5. References

NA