Re: Declination and Inclination

[Frank King]

Dear Fer,

Thank you for your message.  Your procedure
is almost exactly like mine.  I also start
with the equatorial plane (I missed that
step out in my message).  I then:

  1.  Rotate by phi (to make the plane vertical)

  2.  Rotate by Azimuth (to face the plane in the
                          correct direction)

  3.  Rotate by inclination (to tilt it)

We differ at step 1 (you go 90-phi) but, for both
of us, it is then "declination then inclination".

At step 2 we both rotate about a vertical axis
but your axis is perpendicular to the plane
(which is horizontal) whereas mine is IN the
plane (because it is vertical).

For horizontal dials your method is clearly
better because you stop at step 1!!

Best wishes,

Frank

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