Heliocentric Ecliptic Rectangular to Geocentric Ecliptic Spherical coordinates
lon and lat are in radians; X, Y, Z and dist are in Astronomical Units
Pl is planet of interest;
PlX is Heliocentric X coord, PlY is Heliocentric Y coord, PlZ Heliocentric Z coord
Ea is Earth;
EaX is Helio X, EaY is Helio Y, EaZ is Helio z
geocentric longitude = ArcTangent2( (PlY-EaY) , (PlX-EaX) )
geocentric latitude = ArcSine( (PlZ-EaZ) / ( (PlX-EaX)^2 + (PlY-EaY)^2 + (PlZ-EaZ)^2)^1/2 )
geocentric distance = ((PlX-EaX)^2 + (PlY-EaY)^2 + (PlZ-EaZ)^2)^1/2
Note: ArcTangent2 function
Function ArcTangent2 (numerator, denominator)
'theta is the angle, in this case longitude ,
' 0 <= theta < (2 * 3.14159265358979323846)
If numerator = 0 Then
If denominator < 0 Then
theta = 3 * 3.14159265358979323846 / 2
Else
theta = 3.14159265358979323846 / 2
End If
Else
theta =ArcTangent(numerator/denominator)
'this is the conventional ArcTangent function
End If
If numerator < 0 Then
theta = theta + 3.14159265358979323846 / 2
ElseIf numerator > 0 And denominator < 0 Then
theta = theta + 2 * 3.14159265358979323846
End If
Return theta
End Function
The proposed the heliocentric system.
i dont know at the moment......
The heliocentric model is the one that replaces the geocentric model because the heliocentric model better described the solar system.
Geocentric: Earth is center of the solar system. Heliocentric: Sun is the centre of the solar system.
Geocentric theory
Geocentric theory
The heliocentric theory is the idea that planets rotate around the sun, where the geocentric theory said that everything orbited around Earth.
At that time it was still geocentric.
The Heliocentric System. m.i.
Aristotle supported the geocentric model, which placed Earth at the center of the universe. He did not propose a heliocentric model with the Sun at the center. It was later astronomers like Copernicus who challenged the geocentric model in favor of a heliocentric one.
The heliocentric theory is the idea that planets rotate around the sun, where the geocentric theory said that everything orbited around Earth.
Uranus is in the heliocentric system like all the other planets. The geocentric system is now only of interest historically. It wasn't correct.