Hi Stephen,

I agree that your discription of LHA is correct. But for the last
17.5 years that I have been driving this 2.3 meter telescope we have
had displayed on the control computer what we have called LHA. The
PC-TCS Users Manual defines LHA as "simply LST-RA for any given
telescope position, therefore, Hour Angle is positive west and
negative east of the merdian."
This may not be the classic definition but it is very usefull
in any case.

Clear skies,
Dennis

--- In guide-user@yahoogroups.com, Stephen Tonkin <mb@a...> wrote:
> Dennis L. Means <star3248@e...> wrote:
> > I think our definitions of LHA are different. My definition
> > read in hours, minutes, and seconds either east(-) or west (+)
> > of the meridian.
>
> Hour angle is defined as the angle, measured *westward* along the
> celestial equator, between the meridian and the hour circle of the
> object. Using your definition, you'd run into trouble when it comes
to
> sidereal time, which is defined as the hour angle of the FPA.
>
> --
> Stephen Tonkin