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

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 <> 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:

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:
Forum for Physics Educators



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