Astronomy Picture of the Day
http://apod.nasa.gov/apod/ap120626.html
Bob Terwilliger
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https://lists.uni-koeln.de/mailman/listinfo/sundial
Dear All,
This is a high claim for the accuracy of reading a sundial.
I want to add my thoughts about the effect of the EoT to the reading.
Near the dial is a table with the daily correction for longitude and EoT.
Now the values are given for 2011 and 2012.
It looks that every two years this
Dear John:
attached is the table you've asked for. It includes the astronomical year,
the month, day, and time of the event, and azimuth (in degrees) of sunrise
and sunset. Azimuth is measured from North towards East (so North = 0
degrees, East = 90, South = 180, West = 270).
The table is based on
Interesting indeed, but, if the exact time of solstice happens to be at
night, it would not show the word? For the text suggests that it's that
precise.
2012/6/26 Robert Terwilliger b...@twigsdigs.com
Astronomy Picture of the Day
** **
http://apod.nasa.gov/apod/ap120626.html
**
Hi Brad,
It seems that your listing uses the Julian calendar before year +1600, as it
should. But the Julian calendar is not a perfect fit to the tropical year,
and the same problem that necessitated the Gregorian calendar reform would
also apply, in reverse, when going backward in time. In
There was some discussion recently about analemmatic sundials in schools
and safety issues. Martina Addiscott started it going. I would like to
make contact directly with Martina about an analemmatic sundial I am about
to instal in East Sussex, UK, which I believe is near where she lives. Has
Dear Bob and all,
I presented this French sundial in March 2005 as my preferred one:
http://www.cadrans-solaires.fr/cadran-mines.html
http://www.cadrans-solaires.fr/cadran-mines-2.html
I put some photos to show that you can read solstice or equinox at noon some
days before or after the real
