0:53 - Excellent work, John! You adjusted the dial to your longitude! Fantastic! By the way, I am about to make some videos on my formulae for the reclining-declining dial. This, as you know, is the dial that reclines or inclines and does not face any of the four cardinal points of the compass. In Waugh's old book, he gives an empirical method, and Mayhall give the geometry. Neither gives the formulae, so I am up to the angle the meridian line makes with the horizon. I found your video because I was looking for some pics for the video. Great to see that the art is nowhere near lost! Thank you!
Ouch! On second look, you gave the space for the gnomon, my bad. The reflection made it look as if the LAT and LMT were shown, sorry. Still a great-looking sundial, John! Keep it up!
Yes. As far as sundials are concerned this is correct. Not because the sun is traveling the opposite direction but because you have turned your sundial around. In the northern hemisphere, you point your sundial north. In the southern hemisphere, you point it south. However, sundials are designed differently for the northern hemisphere and for the southern hemisphere. On one designed for the northern hemisphere, your a.m. hour lines are to your left (west) and your p.m. hour lines are to your right (east) while the reverse is true for a sundial designed for the southern hemisphere. Makes sense now? 😎
Hello John, we live 8 degrees south of the equator (Indonesia - Bali).Can you explain to me how I can make a horizontal sundial. My problem is, here the sun does down 6 months along the north to the west and six months along the south.
Definitely not a spinning globe, I've been awakened years ago, funny how globetards turn into flat earthers but not one flat earther has turned back into a globetard. No curved water, no 8 inch drop per mile curvature, no real pictures of earth.
No problem, happens often with me too. You have to remember that once Upon a Time we all were globetards, lol we can thank our school teachers for believing such bull crap. .
6 лет назад+7
Jeff sandrock This ONLY works on a spinning sphere globe, as there is 15 degrees between each hour-number. On a flat earth model, the sun would move much faster in the morning and evening, but slower during the mid-day due to the flattards definition of perspective...
Original idea for telling time at night (I call this the moon dial) 1) Make the face of the sun dial out of transparent glow in the dark material 2) Put markings on the leg that supports it 3) As the glow decays through the night, the lowest marking it reaches will be the time
Mr Schultz. I would like to ask a question. I, as a volunteer, interpret the time on a sundial at the Museum of Natural Science in Houston. The dial is listed as # 68 at sundials.org. If you can brouse to that website, there are 3 photos. The middle one shows the Gnomen shadow, as well as an analemma on the left side of the photo. So I interpolate the time, and in the photo it is maybe 10:10. If DST is appropriate, I add an hour. For this time of the year - July, the analemma indicates that 3 minutes should be subtracted to get the corrected time. My problem is that it generally works well around noon, but not at 4PM or 8AM, for example. So my question is the time correction constant throughout the day (- 3 minutes) or does that 3 minutes get modified for earlier or later hours?
Wow wow wow...that is quite an expensive looking one. I will be the first to tell you that I do not have any degree in anything dealing with sundials. However, I do have a very good understanding of how they work and have built my own (numerous ones of various styles) that have all been accurate and remained so throughout the day and year. The equation of time (subtracting 3 minutes for July) should not have to be modified for the time of day. It is modified on a daily basis (generally speaking. It may gain or lose SECONDS over the course of an entire day. Nothing that should throw the time off like that). The only other thing that affects solar time is your longitude. Houston is located roughly at 95°W longitude. This would mean that at noon clock time for your time zone, which is -6 UTC, you would need to add roughly 20 minutes to your local solar time PLUS the equation of time difference to get clock time. However, the difference within the time zone is also constant throughout the day and probably is already be factored into the dial making this unnecessary. I COULD be wrong...BUT...if what you are saying is true, it sounds like someone made a big, expensive mistake laying out the hour lines. How much is it off after your equation of time corrections....say around 4pm? Edit: I suppose it's also a possibility that over time the dial has sunken into the ground, thereby throwing off the angle. It's a heavy pieceof stone and if the ground wasn't properly compacted or a proper foundation built, that COULD be a possibility that it was once accurate but not anymore. I would think that anyone designing something of this size though would definitely take that into consideration but....you never know.
On your armillary sphere why don't you drill a pin hole in the center of where the top of the equatorial ring crosses the longitudinal ring and add a seasonal scale to the inside of the bottom of the longitudinal ring so that a dot of light is cast on the inside of the longitudinal ring, thereby showing the time of year exactly? Of course you would need to bevel the top side of the pinhole to at least 47° so that the rays of the sun aren't obstructed by the thickness of the ring on the solstices.
I'd like to get a sundial that shows me when the equinoxes are, will your sundials show me all four equinoxes, in particular I'm interested on knowing how to determine the spring equinox mostly.
Just so you know. There are only two equinoxes, the Vernal and the Autumnal. I think you may be thinking about the two Solstices, Summer and Winter. If you have a decent globe of the Earth you can see where the sun is for both Solstices. The Summer Solstice takes place when the Sun reaches the Tropic of Cancer. The Winter Solstice occurs when the Sun reaches the Tropic of Capricorn. The equator is midway between the two and when the sun crosses the equator (twice a year) is when the equinoxes (from the word equator) take place. To make it even more confusing it's not the Sun that's doing the moving. Hope this helps.
@@Pgfracing It's pretty easy to build one with minimal tools and minimal parts if you take the time to read how they work/how to build one. I made one accurate to within 2 minutes of clock time and also showing the time of year out of a piece of 4 inch plastic pipe, glue and a scrap wooden board. The only tools I had was a ruler, compass, pencil, hand saw, hand drill and adjustable square. These are all extremely cheap. You could buy the materials and tools for no more than about $40 US, assuming you had to buy ALL of them, starting with nothing. I could send you a link explaining it if you want. Edit: you could actually build one out of tape, cardboard and a cardboard tube.
This helps me understand the suns angle to the earth changes daily through equinox and back again. But given the earth spins at a constant angle every year, ie tilt axis, the sun angle is changing weekly say,,, would highlight rhe fact the sun is going in an elliptical pattern around the earth, assume earth is a flat round disk with a half dome atmosphere over it.. The earth cant be a ball spinning.. As also in new zealand in winter we have 9 hours of daylight in july, and Norway in oslo they have 24 hour daylight. Would love to know suns angle on the same day from alaska.. Equator,, and invercargill new zealand.. I bet it woukd prove sun is the size of the moon and only 20000kms from earth..
we planned our cities so we would have no shade on the streets,sidewalks, in the past we never disrespected the land, when we fail to understand past buildings imprints is so detremental to the environment, as residual heat is released after sunsets, to see blantent attack on the environment is so sad for me, to see everyone fail hurts, we are failing future generations, just by mindlessly letting the developer call the shots, on the environment aswell?
The pagan god of the sun Helios, Heliocentric Theory is just a magic trick to hide that the Earth is motionless and flat, which is what the Bible says.
No we don't. You should probably draw up a mathematical theorem explaining exactly how sundials (ALL varieties of them) are calculated to ONLY work properly and accurately on a sphere yet somehow seem to function just fine on a flat plane and remain accurate throughout the year. Maybe then someone will take you seriously and not idiotically. Don't forget: along with the fame that will come with winning a Nobel Prize also comes a roughly $1.1 MILLION prize. So you really have no excuse. Get to it! (You should probably also pick up a dictionary and look up the definition of *level* ... read the definitions that you haven't cherry picked)
@@American-Plague buddy, most people think the earth is round, which it actually is. There's only a small minority of conspiracy theorists who actually believe the earth is flat, who aren't ironic trolls. Those people are not keen on changing their minds based on evidence. They are fixed in their biases and not understanding of the scientific process. You're just wasting your time trying to lecture them in my opinion.
0:53 - Excellent work, John! You adjusted the dial to your longitude! Fantastic!
By the way, I am about to make some videos on my formulae for the reclining-declining dial. This, as you know, is the dial that reclines or inclines and does not face any of the four cardinal points of the compass. In Waugh's old book, he gives an empirical method, and Mayhall give the geometry. Neither gives the formulae, so I am up to the angle the meridian line makes with the horizon. I found your video because I was looking for some pics for the video.
Great to see that the art is nowhere near lost! Thank you!
Ouch! On second look, you gave the space for the gnomon, my bad. The reflection made it look as if the LAT and LMT were shown, sorry. Still a great-looking sundial, John! Keep it up!
Very cool about the equinox!
Wow John is really a great craftsman, the Egyptians would of loved to have him around.
Nice instruments great video.thanks
How interesting! Thank you!!
I have been told that in the southern hemisphere that the sun travels anti clockwise on a sun dial, is this right ?
Yes. As far as sundials are concerned this is correct. Not because the sun is traveling the opposite direction but because you have turned your sundial around. In the northern hemisphere, you point your sundial north. In the southern hemisphere, you point it south. However, sundials are designed differently for the northern hemisphere and for the southern hemisphere. On one designed for the northern hemisphere, your a.m. hour lines are to your left (west) and your p.m. hour lines are to your right (east) while the reverse is true for a sundial designed for the southern hemisphere. Makes sense now? 😎
I wonder how hard it would be to build a sun dial if the Earth were really moving?
👍
Right? Thank goodness we’re perfectly stationary
Hello John, we live 8 degrees south of the equator (Indonesia - Bali).Can you explain to me how I can make a horizontal sundial. My problem is, here the sun does down 6 months along the north to the west and six months along the south.
okay the equinox ring is really cool
And the video does not actually explain how they work...
yeah, the old man just explains how to read a sundial...
DigitalAwareness (it cannot work on a spinning globe
Definitely not a spinning globe, I've been awakened years ago, funny how globetards turn into flat earthers but not one flat earther has turned back into a globetard. No curved water, no 8 inch drop per mile curvature, no real pictures of earth.
No problem, happens often with me too. You have to remember that once Upon a Time we all were globetards, lol we can thank our school teachers for believing such bull crap. .
Jeff sandrock This ONLY works on a spinning sphere globe, as there is 15 degrees between each hour-number. On a flat earth model, the sun would move much faster in the morning and evening, but slower during the mid-day due to the flattards definition of perspective...
Awesome video! Very cool!
Original idea for telling time at night (I call this the moon dial)
1) Make the face of the sun dial out of transparent glow in the dark material
2) Put markings on the leg that supports it
3) As the glow decays through the night, the lowest marking it reaches will be the time
Mr Schultz. I would like to ask a question. I, as a volunteer, interpret the time on a sundial at the Museum of Natural Science in Houston. The dial is listed as # 68 at sundials.org. If you can brouse to that website, there are 3 photos. The middle one shows the Gnomen shadow, as well as an analemma on the left side of the photo. So I interpolate the time, and in the photo it is maybe 10:10. If DST is appropriate, I add an hour. For this time of the year - July, the analemma indicates that 3 minutes should be subtracted to get the corrected time. My problem is that it generally works well around noon, but not at 4PM or 8AM, for example. So my question is the time correction constant throughout the day (- 3 minutes) or does that 3 minutes get modified for earlier or later hours?
Wow wow wow...that is quite an expensive looking one. I will be the first to tell you that I do not have any degree in anything dealing with sundials. However, I do have a very good understanding of how they work and have built my own (numerous ones of various styles) that have all been accurate and remained so throughout the day and year. The equation of time (subtracting 3 minutes for July) should not have to be modified for the time of day. It is modified on a daily basis (generally speaking. It may gain or lose SECONDS over the course of an entire day. Nothing that should throw the time off like that). The only other thing that affects solar time is your longitude. Houston is located roughly at 95°W longitude. This would mean that at noon clock time for your time zone, which is -6 UTC, you would need to add roughly 20 minutes to your local solar time PLUS the equation of time difference to get clock time. However, the difference within the time zone is also constant throughout the day and probably is already be factored into the dial making this unnecessary. I COULD be wrong...BUT...if what you are saying is true, it sounds like someone made a big, expensive mistake laying out the hour lines. How much is it off after your equation of time corrections....say around 4pm?
Edit: I suppose it's also a possibility that over time the dial has sunken into the ground, thereby throwing off the angle. It's a heavy pieceof stone and if the ground wasn't properly compacted or a proper foundation built, that COULD be a possibility that it was once accurate but not anymore. I would think that anyone designing something of this size though would definitely take that into consideration but....you never know.
Hello John, could I use old barrel rings for part of the sun dial please, Maria
Great video.
do sundials tell you the position of the sun in the sky, as in degrees?
They can if you designed one to do that.
On your armillary sphere why don't you drill a pin hole in the center of where the top of the equatorial ring crosses the longitudinal ring and add a seasonal scale to the inside of the bottom of the longitudinal ring so that a dot of light is cast on the inside of the longitudinal ring, thereby showing the time of year exactly? Of course you would need to bevel the top side of the pinhole to at least 47° so that the rays of the sun aren't obstructed by the thickness of the ring on the solstices.
Great video!
I'd like to get a sundial that shows me when the equinoxes are, will your sundials show me all four equinoxes, in particular I'm interested on knowing how to determine the spring equinox mostly.
Just so you know. There are only two equinoxes, the Vernal and the Autumnal. I think you may be thinking about the two Solstices, Summer and Winter. If you have a decent globe of the Earth you can see where the sun is for both Solstices. The Summer Solstice takes place when the Sun reaches the Tropic of Cancer. The Winter Solstice occurs when the Sun reaches the Tropic of Capricorn. The equator is midway between the two and when the sun crosses the equator (twice a year) is when the equinoxes (from the word equator) take place. To make it even more confusing it's not the Sun that's doing the moving. Hope this helps.
Ed D. thanks Ed I'll have to read about what the difference between Equinoxes and Solstices are.
@@Pgfracing It's pretty easy to build one with minimal tools and minimal parts if you take the time to read how they work/how to build one. I made one accurate to within 2 minutes of clock time and also showing the time of year out of a piece of 4 inch plastic pipe, glue and a scrap wooden board. The only tools I had was a ruler, compass, pencil, hand saw, hand drill and adjustable square. These are all extremely cheap. You could buy the materials and tools for no more than about $40 US, assuming you had to buy ALL of them, starting with nothing. I could send you a link explaining it if you want.
Edit: you could actually build one out of tape, cardboard and a cardboard tube.
@American-Plague I would be interested in checking out a link if you would like to share with me also
i live in new zealand and am looking for a wall mounting sundial for the southern hemisphere. do you make them for export?
Hey, I know Lititz, PA. Born and raised there. Graduated Warwick High 1982.
How do I contact you to make a purchase? Please reply.
Hi. Are you in Lincoln?
Daylight Savings Time is now a thing of the past 🙌
wow, thanks for the info
are sundials universal? would they work the same in the northern hemisphere as they would in the southern hemisphere
no they do not work at all on the equator unless it sideways. because we are not living on a ball. . :/
steven gomez yes they work the same in the southern hemisphere as they do in the northern hemisphere Now isn't that something
@@josephfrancisruggia Bullshit. They work just fine on the equator. In fact, they are a lot more simple to construct on the equator. Idiot.
@@josephfrancisruggia don't take away my cartoon ball.
Thank you for such and awesome video am always wondering, when i read the book of Isiah
Cool
mine is too
well i understand how it works.
👌
Very gooodddd 🇸🇦🇸🇦🇸🇦👍🏼👍🏼👍🏼👍🏼
good
ot
good.......
This helps me understand the suns angle to the earth changes daily through equinox and back again. But given the earth spins at a constant angle every year, ie tilt axis, the sun angle is changing weekly say,,, would highlight rhe fact the sun is going in an elliptical pattern around the earth, assume earth is a flat round disk with a half dome atmosphere over it.. The earth cant be a ball spinning.. As also in new zealand in winter we have 9 hours of daylight in july, and Norway in oslo they have 24 hour daylight. Would love to know suns angle on the same day from alaska.. Equator,, and invercargill new zealand.. I bet it woukd prove sun is the size of the moon and only 20000kms from earth..
Beautiful. I bet those are way too expencive though lol.
Im still confused anymore else just me ok
I’ll fix your website in exchange for one of your Armillary sundials. :)
what if its cloudy!!!!
well! rise above the clouds with sundial!
sinhaimano sinha if it’s cloudy they would use candle clocks!
Or we could just stop doing daylight savings time
Younger bro of Arsene Wenger!!!!🙂
if the earth were flat, you would not need two rings, with two squares the clock would work .... ha ha
Water proves the Earth is flat.
Earth is flat and stationary
we planned our cities so we would have no shade on the streets,sidewalks, in the past we never disrespected the land, when we fail to understand past buildings imprints is so detremental to the environment, as residual heat is released after sunsets, to see blantent attack on the environment is so sad for me, to see everyone fail hurts, we are failing future generations, just by mindlessly letting the developer call the shots, on the environment aswell?
now i know that the earth is flat and sun is moving :)
i came her to look as well brother. stay awake
if the earth were flat, you would not need two rings, with two squares the clock would work .... ha ha
And now we know how childish and uneducated you are.
The pagan god of the sun Helios, Heliocentric Theory is just a magic trick to hide that the Earth is motionless and flat, which is what the Bible says.
bekqqqr
Yes slodkiocb
creepy
So do you see that the earth is flat ? Not curve ! Water is always level!
No we don't. You should probably draw up a mathematical theorem explaining exactly how sundials (ALL varieties of them) are calculated to ONLY work properly and accurately on a sphere yet somehow seem to function just fine on a flat plane and remain accurate throughout the year. Maybe then someone will take you seriously and not idiotically. Don't forget: along with the fame that will come with winning a Nobel Prize also comes a roughly $1.1 MILLION prize. So you really have no excuse. Get to it! (You should probably also pick up a dictionary and look up the definition of *level* ... read the definitions that you haven't cherry picked)
The Earth is round, duh
@@American-Plague buddy, most people think the earth is round, which it actually is. There's only a small minority of conspiracy theorists who actually believe the earth is flat, who aren't ironic trolls. Those people are not keen on changing their minds based on evidence. They are fixed in their biases and not understanding of the scientific process. You're just wasting your time trying to lecture them in my opinion.
@@thebeast5215 I don't want to change his mind. I want him to design a sundial that works on a model of a flat Earth.
good