{Star Cycles (I) – Colours}[19th November 1987]

[Redbook4:155][19871119:2312e]{Star Cycles (I) – Colours}[19^th November 1987]

19871119:2312

[continued]

But* I have in the past considered the Circle relationships to wavelengths, based on colours; e.g.:**

			Green
		Yellow	WHITE	Light Blue
	(Orange)
Red			[+]			Blue
		Purple		Mauve
		(Infra-red)		(Ultra-violet)
			(Black)

If*** the Hertzsprung-Russell Diagram main sequence plotting colour and temperature (identically, as spectral type) against luminosity correctly identifies the normal life of a hydrogen-fusing star (OBAFGKM), it can be plotted on the circle very precisely[:]

				(I~)
				←
***(Our Sun)			F		A
			G***	│	B
		↓K		│		O↑
(G~)		↓M	────	+	────			(M~)
				│
				│
				[A~]

[In the ms diagram the arrows continuously curve anticlockwise round the upper semicircle.]

***

*[Ref last previous entry(/entries?), presumably.]

**(ref.: Chartrand: Amateur Astronomy Pocket Skyguide (Newnes) pp48-51.)

***{This is all misunderstood: see [[Redbook4:163][19871121:1310b]{Star Cycles (III) – The Main Sequence}[21st November 1987],] p163.}

[continues]

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