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Modest Learner
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Homework Statement
In spherical coordinates (ρ,θ,ø); I understood the ranges of ρ, and θ. But ø, still eludes my understanding. Why is ø only from 0 to π, why not 0 to 2π??
Modest Learner said:Homework Statement
In spherical coordinates (ρ,θ,ø); I understood the ranges of ρ, and θ. But ø, still eludes my understanding. Why is ø only from 0 to π, why not 0 to 2π??
Ray Vickson said:Look at a diagram to see why.
MrAnchovy said:## \phi = 0 ## is directly overhead, ## \phi = \pi ## is directly beneath your feet, where would ## \phi = 2\pi ## be?
Modest Learner said:When I view from side, ø = π, covers only half the circle (see the picture).
MrAnchovy said:So what you have shown is a coloured half-disk. For every point on that disk, Θ = 0. If you vary Θ from 0 to 2π the half-disk will sweep out a complete sphere.
Modest Learner said:If seeing the diagram would have had helped, then I would not have asked the question in the first place.
Spherical coordinates are a system for locating points in three-dimensional space using three coordinates: radial distance from the origin, inclination angle from the positive z-axis, and azimuth angle from the positive x-axis.
While Cartesian coordinates use three perpendicular axes (x, y, and z) to locate a point in space, spherical coordinates use a radial distance, inclination angle, and azimuth angle to locate a point on a sphere centered at the origin.
To convert from spherical coordinates to Cartesian coordinates, use the following formulas:
x = r * sin(θ) * cos(ϕ)
y = r * sin(θ) * sin(ϕ)
z = r * cos(θ)
To convert from Cartesian coordinates to spherical coordinates, use these formulas:
r = √(x² + y² + z²)
θ = arccos(z/r)
ϕ = arctan(y/x)
Spherical coordinates are often used in physics and engineering, particularly in problems involving spherical objects or systems. They are also commonly used in astronomy to locate celestial objects in the sky.
No, spherical coordinates are only used in three-dimensional space. In two-dimensional space, polar coordinates are used instead, which only require two coordinates: radial distance and angular direction from a reference point.