Re: [Phys-L] Ex: celestial motions

[brian whatcott <betwys1@sbcglobal.net>]

On 8/13/2019 9:50 AM, John Denker via Phys-l wrote:
> You guys are using similar words to describe two different things:
>
> On 8/12/19 10:12 PM, Albert J. Mallinckrodt wrote:
> > The moon and the sun both ???move??? their own diameters in about 2
> > minutes.		[a]
> On 8/12/19 6:37 PM, Anthony Lapinski wrote:
> > [the moon] moves its own diameter across the sky each hour. [b]
> I say [b] refers to the moon's motion relative to the fixed stars.
> Roughly 0.5/(360/28/24) = 0.93
>
> Meanwhile [a] refers to sun or moon's motion across the sky,
> relative to the meridian arc.
>
> > Sunsets appear to take  longer
> They *do* take longer, because the sun generally does not set
> perpendicular to the horizon.  /snip/

Interesting use of the term "perpendicular"!

Brian W