CL_gm_eclipseCheck

Description

• Computes the hidden fraction of a body (eclipsed by another body), as seen from an observer:

  - 1.0 : 100% of the first body is eclipsed

  - 0.7 : 70% of the first body is eclipsed

  - 0.0 : 0% of the first body is eclipsed

  The two bodies are assumed spherical

  

Parameters

pos_obs:

Position of observer (3xN or 3x1)

pos1:

Position of centre of sphere1 (3xN or 3x1)

pos2:

Position of centre of sphere2 (3xN or 3x1)

sr1:

Radius of sphere1 (1x1 or 1xN)

sr2:

Radius of sphere2 (1x1 or 1xN)

rat_ecl:

Hidden fraction of body1, as seen from pos_obs (3xN)

Authors

• CNES - DCT/SB

See also

• CL_gm_inters3dConesSa

Examples

// Fraction of Sun eclipsed by Earth (from an observer in space): radiusSun = CL_dataGet("body.Sun.eqRad"); radiusEarth = CL_dataGet("body.Earth.eqRad"); au = CL_dataGet("au"); theta = linspace(2.88, 3.05, 100); pos_obs = 42000.e3 * [cos(theta); sin(theta); zeros(theta)]; pos1 = au * [1; 0; 0]; // Sun sr1 = radiusSun; pos2 = [0; 0; 0]; // Earth sr2 = radiusEarth; rat_ecl = CL_gm_eclipseCheck(pos_obs, pos1, pos2, sr1, sr2); scf(); plot(theta*180/%pi, rat_ecl, "o");