Ah, so that's what the enquiry was about!
The correct URL is http://www.mhs.ox.ac.uk/epact
In the picture in the catalogue, which is the only one
I've seen of this dial, this inferior polar dial isn't visible.
But I have to agree that 4,6,8 sounds
unlikely.
How much do we know about
.
Picture 5 shows the details of the north facing inferior polar dial from the
north west. The engraved lines are not too clear and no numbers are visible.
I could see only three lines, one for midnight and one one each side,
perhaps showing sunrise and sunset as discussed in my earlier note.
Strange
What hour lines should be inscribed, and in what places, on an inferior polar dial for latitude 52N? The centrally-placed gnomon is 13 units high, the overall plate width (east-west) is 37 units and the north-south plate height is 26 units.
Thank you for the various replies sent in (4).
I
usly there is a need to look at the dial closely in April!
Regards,
John
--[EMAIL PROTECTED] wrote:
On 25th Jan I posted the following query:What hour lines should be inscribed, and in what places, on an inferior polar dial for latitude 52N? The cen
rth facing inferior polar dial from
the north west. The engraved lines are not too clear and no numbers are visible.
I could see only three lines, one for midnight and one one each side, perhaps
showing sunrise and sunset as discussed in my earlier note.
Thanks
for the question David.
Hi David,
if I
have not made great mistakes in my calculations - done quickly :-)
- you cannot inscribe any hour lines on your polar sundial facing
north.
At Lat.
52N on summer solstice, the Sun rises at 3h 47m (civil time) or at 3h 45m apparent Solar time.
s, please refer to my presentation on Sunset Phenomenon on the
NASS Repository or I can provide copies on request.
-Original Message-From:
[EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On
Behalf Of [EMAIL PROTECTED]Sent: January 25, 2004 11:40
AMTo: sundial@rrz.uni-koeln.deSubject: Inferio
Pardon my ignorance David, but what's an "inferior" polar
dial, please?
Surely the latitude is irrelevant, as a polar dial is
merely inclined.
If I'[m right in thinking the dial is shaped like an
inverted letter "T", it seems to me that the shadow of the gnomon wi
On Sun, 25 Jan 2004 [EMAIL PROTECTED] wrote:
I think I know the answer to this one, and I'll say more in due course, but
just to see what all you gurus say..
What hour lines should be inscribed, and in what places, on an inferior polar
dial for latitude 52N? The centrally-placed
What hour lines should be inscribed, and in what places, on an inferior polar dial for latitude 52N? The centrally-placed gnomon is 13 units high, the overall plate width (east-west) is 37 units and the north-south plate height is 26 units.
David Brown
Somerton, Somerset, UK
Thanks for your interest, Chris
David Brown
Somerton, Somerset, UK
11 matches
Mail list logo
