Constants
Constants necessary to computations
All units are in SI
- class beyond.constants.Body(name, mass, equatorial_radius, *, flattening=1, **kwargs)
Generic class for the description of physical characteristics of celestial body
- property eccentricity
Eccentricity of the body
- equatorial_radius
Equatorial radius of the celestial body
- flattening
Flattening of the celestial body
- mass
Mass of the celestial body
- property mu
Standard gravitational parameter of the body
- name
Name of the celestial body
- polar_radius()
Polar radius of the body
- propagate(date)
Gives the statevector of the celestial body
Warning
A propagator should be attached to this body, as there is none provided by default. This can be done by setting
Body.propagator. Seesolarsystemorjpland their respectiveget_body()functions.- Parameters:
date (Date)
- Return type:
- Raises:
BeyondError – when no propagator is attached to the object
- propagator
Propagator, not set by default
- beyond.constants.Earth = <Body 'Earth'>
Earth physical characteristics
- beyond.constants.G = 6.6740831e-11
Gravitational constant in m³.kg⁻¹.s⁻² or N.m².kg⁻²
- beyond.constants.Mars = <Body 'Mars'>
Mars physical characteristics
- beyond.constants.Moon = <Body 'Moon'>
Moon physical characteristics
- beyond.constants.Sun = <Body 'Sun'>
Sun physical characteristics
- beyond.constants.c = 299792458
Speed of light in m.s⁻¹
- beyond.constants.g0 = 9.80665
Standard Earth gravity in m.s⁻²