I forgot I did this once before for an object collection item. I ended 
up copying the code and re-using it.

#declare latitude_pigment_1 = pigment
{
	radial
	color_map
	{
		[0.5 color srgb <040,066,018>/255]
		[0.5 color srgb <067,084,029>/255]
	}
	frequency longitude_div/2
}
#declare latitude_pigment_2 = pigment
{
	radial
	color_map
	{
		[0.5 color srgb <067,084,029>/255]
		[0.5 color srgb <040,066,018>/255]
	}
	frequency longitude_div/2
}
/*
#declare radius_pigment = pigment
{
	function {f_r(x,y,z)}
	pigment_map
	{
		[0 color srgb 1/2]
		[1 latitude_pigment_1]
	}
}
*/
#declare longitude_pigment = pigment
{
	function {f_ph(x,y,z)/pi}
	pigment_map
	{
		[0.5 latitude_pigment_1]
		[0.5 latitude_pigment_2]
	}
	frequency longitude_div/4
}
#declare checker_sphere_pigment = pigment {longitude_pigment}

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