Date: Fri, 22 Jan 1999 00:05:49 -0500
To: [EMAIL PROTECTED]
From: [EMAIL PROTECTED]
Subject: Re: Analemmatics on a Gradient
In-Reply-To: [EMAIL PROTECTED]
I have always found it easiest to think of an analemmatic dial as the
downward projection of an armillary sphere onto a surface directly
Dear Fellow Shadow Watchers,
Imagine a man sitting on the sun, (Yes! rather hot), watching
the light of the sun fall on the Earth. As light takes 8 minutes to
reach Earth, then it should be possible to see a small dark edge due to
Earth's rotation. This will represent 8 minutes of
Could this be that in theory the sun sets due west on the equinox (as it
would if the earth had no atmosphere) but in reality is sets slightly south
of due west due to refraction, and would this explain the time delay? This
has really bothered me, because I want my dials to be correct.(my dials
Hello All:
I've been enjoying the discussion on the delay of sunset due to refraction.
Somewhere I heard that at mid latitudes this is about three minutes. Can
anyone confirm this?
Here is the reason I ask. On the outer edge of my horiz. sundials I engrave
little sunrises and sunsets which
We are coming up to the day when sunset lines up with the Infinite Corridor
at MIT (Massachusetts Institute of Technology) in Cambridge, MA, USA.
I may try and observe it this year.
http://w3.mit.edu/afs/athena.mit.edu/org/p/planning/www/mithenge
