Re: [Phys-L] analemma and equation of time

[Anthony Lapinski <alapinski@pds.org>]

Very nice! I teach high-school astronomy in a planetarium and will be doing
a celestial motion activity next week to observe the altitude of the Sun at
noon for various latitudes. I recall decades ago there was a photo in *Sky
And Telescope* of the analemma where someone photographed the Sun every two
weeks over the year; I was intrigued by the asymmetric figure-eight pattern.

On Tue, Sep 15, 2020 at 6:15 AM John Denker via Phys-l <
phys-l@mail.phys-l.org> wrote:

> Hi --
>
> In honor of the upcoming equinox:
>
> We have previously discussed the analemma (i.e. the position of
> the sun in the noonday sky) and the equation of time.
>
> I made a *much* improved diagram, and wrote up the discussion as
> a web page:
>   https://www.av8n.com/physics/analemma.htm
>
> If anybody is interested in playing with this, I have a python
> program that does all the relevant calculations, including the
> coordinate grid lines (which are a pain to calculate). It's
> based on Skyfield library routines.  (There are other packages
> out their, but they seem to be nowhere near as nice.)
>
> ==========
>
> Also, a javascript countdown timer:
>   https://www.av8n.com/physics/equinox-timer.html
> _______________________________________________
> Forum for Physics Educators
> Phys-l@mail.phys-l.org
> https://www.phys-l.org/mailman/listinfo/phys-l

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