On the equator it has to be horizontal - tilted 90°.Yep, I'm getting there... but what tilting of the gnomon would alter what you're saying?
Electrical Question in 'Pub Quiz'
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Think what good would a horizontal gnomon be at the poles?
I think I might be getting lost again. Will not the shadow of anything, of any shape, size or orientation, at a particular time of day (other than midday), move by ± ~23° with the changing seasons?
Kind Regards, John
Are you talking about 'minutiae' (variation in tilt) - since, if the tilt of the earth remains fixed, I would not have expected any variation in day length at the equator?
Kind Regards, John
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Yes, but only a horizontal straight gnomon parallel to the Earth's axis will be in the same plane as the relevant straight mark on the scale at a particular time of day throughout the year.
That plane will move north and south ±23.5° during the year but that does not matter as the gnomon and scale lines are straight and in a north-south orientation.
Yes, it would be a tiny variation in day length.
Gentlemen, and any Ladies who might be interested in these proceedings, I am truly amazed that my little "contribution" (at #51) has provoked such a discussion
It seems to me that the only areas on Earth where Sun-Dials could be "used" would be between the relevant "Tropic" and the associated Arctic/Antarctic Circle - and not too close to any of those.
Of course, I note that "modern" Sun-Dials include "corrections" cast into the horizontal plate for days/months throughout the year.
(e. g. https://us-browse.startpage.com/av/anon-image?piurl=http://www.whitehousegardens.com.au/wp-content/uploads/wpsc/product_images/Sundial%20Aust%20made.JPG&sp=1593787163Tc18d536597ac7bba4422b3f32ac851d058c1a98f939dba0d501a8d52de73067e which is actually a Southern Hemisphere Sun-Dial, as compared to this https://eu-browse.startpage.com/av/...609ebf2f1fc044f712f7a70f5c0abc0b32ab67c5299ed (idolised) Northern Hemisphere Sun-Dial.)
However, the "correction" for "Summer time" is left up to the viewer.
After posting it I started to consider the problem of using Sun-Dials between the Tropics of Cancer and Capricorn and I do wonder if such Sun-Dials exist.
It seems to me that the only areas on Earth where Sun-Dials could be "used" would be between the relevant "Tropic" and the associated Arctic/Antarctic Circle - and not too close to any of those.
Of course, I note that "modern" Sun-Dials include "corrections" cast into the horizontal plate for days/months throughout the year.
(e. g. https://us-browse.startpage.com/av/anon-image?piurl=http://www.whitehousegardens.com.au/wp-content/uploads/wpsc/product_images/Sundial%20Aust%20made.JPG&sp=1593787163Tc18d536597ac7bba4422b3f32ac851d058c1a98f939dba0d501a8d52de73067e which is actually a Southern Hemisphere Sun-Dial, as compared to this https://eu-browse.startpage.com/av/...609ebf2f1fc044f712f7a70f5c0abc0b32ab67c5299ed (idolised) Northern Hemisphere Sun-Dial.)
However, the "correction" for "Summer time" is left up to the viewer.
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Following the various discussions (during the course of which my thinking got very 'far from straight' at times - but EFLI eventually got be back on track!), I see no reason why the sundial illustrated in EFLI's post #60 should not work at the equator, between the tropics or anywhere else, provided only that the inclination of the gnomon were adjusted appropriately for the latitude in question (horizontal, per the photo, at the equator, vertical at the poles, or anything else in-between).
Kind Regards, John
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I found the link did not work think this
should have been shown, what ever startpage is it stopped being able to see the page. It would be a good pub quiz question. I never remember seeing a sun dial when working in the Falklands. What I do remember was high winds were in the summer not winter.
But writing quiz questions is not easy, I was asked to write the questions when in the Falklands, tried to keep it topical about the Falklands, which was first settlement, who were the first setters etc. I even did it as tick correct box so tick all A would get 25%, but the military on the mountain site managed to get 18% how? I was not asked to do it again.
So "In a standard UK plug mains plug, what colour is the Neutral wire?" well in a standard UK plug there are no wires, these are added by the user, so question should have been "In a standard UK flex used after 1971 in a mains plug, what colour is the Neutral wire?" however today not so easy, too many smart phones, I remember doing a quiz which asked what it outside the Red Lion hotel, however it was actually called the Y Llew Coch the whole thing it seems had been written in Welsh then translated, and they had also translated the pub name.
But writing quiz questions is not easy, I was asked to write the questions when in the Falklands, tried to keep it topical about the Falklands, which was first settlement, who were the first setters etc. I even did it as tick correct box so tick all A would get 25%, but the military on the mountain site managed to get 18% how? I was not asked to do it again.
So "In a standard UK plug mains plug, what colour is the Neutral wire?" well in a standard UK plug there are no wires, these are added by the user, so question should have been "In a standard UK flex used after 1971 in a mains plug, what colour is the Neutral wire?" however today not so easy, too many smart phones, I remember doing a quiz which asked what it outside the Red Lion hotel, however it was actually called the Y Llew Coch the whole thing it seems had been written in Welsh then translated, and they had also translated the pub name.
The wire is copper colour, what colour is the insulation on the Neutral wire ?
Scorched is an acceptable answer.
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Like it, pedantic rules. when was tinned and aluminium cable stopped being used? Is silver an acceptable answer?
Only if hallmarked
IMO it's actually a very difficult, I've been running at least one quiz per year [and up to 5 per year] for some 15-20 years. Although I try very hard to get the answers right the inevitable happens. When working I used to get my colleagues to read the question paper and give me [or write down] the answers which 'usually' found my errors but when there was only nine questions on a paper all 4 of them didn't notice Now I always add an additional question to each round, just in case.
The main difficulties I find is:
Creating and writing questions which are outside of my knowledge and
Setting the difficulty, my aim is for a 2/3 average score for each round. I mark out of 360 points for the whole quiz, that's 9 rounds and 2 marathons with 30 points each plus a 'joker'. Usually the total is near the 2/3 area but not every round.
This one was a little erratic:
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