Regarding 2:03, the middle bridge of the equinoctial sundial is also known as its gnomon. The slider is moved corresponding to the month of the year. The slider positioned at the center of the gnomon corresponds to the Vernal Equinox on March 20 as well as the Autumnal Equinox on September 22 when the Solar Declination is 0°. However the slider position at each opposite end of the gnomon corresponds to either the Summer Solstice on June 21 when the Solar Declination is +23.45° or the Winter Solstice on December 21 when the Solar Declination is -23.45°.
I discovered am is when it's flat like it was in the box. Pm is where it's tilted towards the things that keep the inside ring flat in the middle. If you set it up right there shouldn't be a light if it's pm and you set the dial to am. Hope that helps.
Arrived today. Brilliant. Really pleased and excellent workmanship. OK. It doesn't tell the time to the minute but I would not expect it to do so. However, it is really interesting to consider how it works. Thanks. It's definitely more than a toy. beautifully engraved as well - a pleasure to hold.
I just got mine. I'm impressed by the size, weight and solid build of this brass instrument. I'm somewhat less impressed by the quality of the engraving. It appears stamped, not hand engraved. The Roman numerals are not concentric with the time ring--off by about a quarter of a millimeter. The engraving on the north side of the bridge is not equally deep. The shallower engraving looks washed out and is hard to read. Kala would do well to check the tolerances of their stamping machines more often to improve quality control. THE ACCURACY OF THIS POCKET SUNDIAL IS OUTSTANDING. I live in Tucson, Arizona 32ºN 111ºW, which means I'm 6º west of the center of my time zone. To test the instrument I set the latitude and date as accurately as I could. I measured my local solar time as 11:45 A.M. I multiplied 6º by 4 to come up with a 24 minute time adjustment. I added this to my solar time then looked at my atomically controlled watch. It read 11:59 A.M. Perfect! (West is best and east is least when figuring your mean solar time. Look it up.) Arizona does not do Daylight Saving Time. I wish the rest of the world would do away with that DST garbage, but I digress. The pocket sundial requires that the sun is completely free of clouds. Any partial blocking or diffusion caused by thin clouds, haze, smoke or fog will interfere with the ability to project a clear circle of light on the time ring. BTW the Kala pocket sundial can be used as an astrolabe to figure your latitude at night. Simply dangle the sundial from its string and align the rivets securing the bridge to the outer ring with the north star, Polaris. Use the rivets on the opposite sides of the outer ring that line up parallel with the centerline of the bridge. If the rivets don't point at the north star, adjust the latitude pointer on the outer ring to a higher latitude if Polaris is above the rivet line or to a lesser latitude if Polaris is below that line. Once the two rivets point at Polaris your latitude is set. You could also just rotate the bridge perpendicular to the outer ring and sight along the length of the bridge. This might be easier for some. Use this procedure on the center of southern cross if you are in the southern hemisphere.
@@alanbanh Good point. It is a small sundial. The margin for error can be large. The best you should expect is plus or minus about 15 minutes of the actual time. That has been my average result. I guess the results in my original comment were unusually accurate. A larger sundial can be much more precise, but is a pain to carry around.
Nicely explained. You could also point out that this sundial can also be used as a compass, since the outer ring is in the north-south plane when the spot of light falls on the inner ring and tells the correct time. This loses accuracy near noon, and in fact near noon it can be hard to know if it is, say, half an hour to midday or half an hour after midday. Also, you could note that sun time is up to 16 minutes fast or slow compared with a clock due to the earth's orbit, and your time zone may introduce another difference from clock time. So don't expect a sundial to tell the same 'time' as a clock. This type of dial indicates 12 o'clock when the sun is at its highest, half way between sunrise and sunset.
Great comment, thanks Chris! I really appreciate your detailed explainations. We intentionally tried to keep this video simple but might consider to do another "Pro version" deep diving into insights like the ones mentioned by you. Thanks again!
I think the Equation of Time is small enough, compared with the resolution of a ring dial, that you could ignore it, but it dismays me that most people imagine that sundials are inherently inaccurate. So I like to let them know that, with a couple of simple refinements, sundials can tell time as well as many watches.
Chris Lusby Taylor time doesn't exist clocks do, the earth is flat and stationary a dial wouldn't work on a spinning ball neither could you time lapse the stars and North Star if 'we' was moving, research flat earth ;)
MilesDei I don't think I know, and as for thick twit, id kick your butt word and spar and win every time. Research flat earth, concentrate on water, it's called sea level for a reason, no where on earth does water conform to the exterior of shapes, no where, the is no curvature, no curve no ball, there's no experiment that's shows the earth is moving, none, ever!
Understand the parts, understand how to set it up. It just doesn't project a "beam of light" on the hour ring for me....more like a shiny blur about 5mm wide. What's more, the shiny blur moves on the ring as I slowly rotate the sundial trying to get the beam to focus on a particular spot...the blur moves 2-3 hours in each direction but is never "a spot". It's a curio, but not a useful one. The ring is marked 1-12 in Roman numerals on each half, but which side is "morning" and which side is "afternoon" is a mystery.
The "beam of light" is an inaccurate description. It is a small, 2 millimeter, or 1/16 of an inch, circle of light. I had the same result as you (a blurry bar of light) for a few minutes, but after doing a little more research I found a video showing how to operate it, and it included a visual example of the dot of light. The video also explains which half is morning, and which half is afternoon. I think it will answer most of the questions you might have in how to operate the device. Aside from all of that, I agree with your conclusion with the device being an interesting, but non-essential curio. You need to be in direct sunlight to operate it, and you need to know your current locations geographic latitude. As a curio, it makes for a great static desk toy, because when you have it set up correctly, and it is hung someplace where it won't be disturbed, the device will tell you the following information (as written in the manual that came with it): "The outer ring is now positioned North/South. The inner ring is parallel to the equator, and the bridge is parallel to the Earth's axis. Thus, you not only have a sundial, but also a model of the Earth and a compass!" For information on how to operate the device, check out this video: ruclips.net/video/MVIlcSbQCIc/видео.html&ab_channel=WatchGeek
@@darylnewhouse1796Look at the inner ring. There will be two faces. One face will have 1-12 going clockwise and the other will have it numbered anticlockwise. The side on the right is AM and the side on the left is PM. Think of the top as midnight and the bottom as noon. How do you tell where the top is? The top has the triangular piece.
No (this dial does not automatically account for the EOT). Neither would it account for mean solar time (your longitude within your time zone). At WORST however, it would never be off by more than 46 minutes.
Will not so k I. Sydney despite setting as described since the Roman numerals will need to be reversed! I know you won’t believe me but take this lovely little object when you cross the equator and you’ll see that I’m right! (Because your shadow now points south and not north but east and west don’t change). Look at the moon whilst your there and the other surprise is that it’s upside down - Honestly 😮)
The HB version is a gimmicky piece of “made in China.” Kali sundials are expertly machined and fitted with precision. Nothing loose or flimsy. I was very impressed when mine arrived, but still working on my time-reading skills.
![Noob To Max With DRAGON REWORK In Blox Fruits [FULL MOVIE]](http://i.ytimg.com/vi/LnBMOinoOvA/mqdefault.jpg)
Regarding 2:03, the middle bridge of the equinoctial sundial is also known as its gnomon. The slider is moved corresponding to the month of the year. The slider positioned at the center of the gnomon corresponds to the Vernal Equinox on March 20 as well as the Autumnal Equinox on September 22 when the Solar Declination is 0°. However the slider position at each opposite end of the gnomon corresponds to either the Summer Solstice on June 21 when the Solar Declination is +23.45° or the Winter Solstice on December 21 when the Solar Declination is -23.45°.
After watching the video I am still confused about morning and evening on the center piece. Can someone explain it to me please? Thanks! :)
I discovered am is when it's flat like it was in the box. Pm is where it's tilted towards the things that keep the inside ring flat in the middle. If you set it up right there shouldn't be a light if it's pm and you set the dial to am. Hope that helps.
Arrived today. Brilliant. Really pleased and excellent workmanship. OK. It doesn't tell the time to the minute but I would not expect it to do so. However, it is really interesting to consider how it works. Thanks. It's definitely more than a toy. beautifully engraved as well - a pleasure to hold.
Great description on how to use, and a wonderful idea for a gift !
Absolutely phenomenal video! Thanks so very much! 😊
I just got mine. I'm impressed by the size, weight and solid build of this brass instrument. I'm somewhat less impressed by the quality of the engraving. It appears stamped, not hand engraved. The Roman numerals are not concentric with the time ring--off by about a quarter of a millimeter. The engraving on the north side of the bridge is not equally deep. The shallower engraving looks washed out and is hard to read. Kala would do well to check the tolerances of their stamping machines more often to improve quality control.
THE ACCURACY OF THIS POCKET SUNDIAL IS OUTSTANDING. I live in Tucson, Arizona 32ºN 111ºW, which means I'm 6º west of the center of my time zone. To test the instrument I set the latitude and date as accurately as I could. I measured my local solar time as 11:45 A.M. I multiplied 6º by 4 to come up with a 24 minute time adjustment. I added this to my solar time then looked at my atomically controlled watch. It read 11:59 A.M. Perfect! (West is best and east is least when figuring your mean solar time. Look it up.)
Arizona does not do Daylight Saving Time. I wish the rest of the world would do away with that DST garbage, but I digress. The pocket sundial requires that the sun is completely free of clouds. Any partial blocking or diffusion caused by thin clouds, haze, smoke or fog will interfere with the ability to project a clear circle of light on the time ring.
BTW the Kala pocket sundial can be used as an astrolabe to figure your latitude at night. Simply dangle the sundial from its string and align the rivets securing the bridge to the outer ring with the north star, Polaris. Use the rivets on the opposite sides of the outer ring that line up parallel with the centerline of the bridge. If the rivets don't point at the north star, adjust the latitude pointer on the outer ring to a higher latitude if Polaris is above the rivet line or to a lesser latitude if Polaris is below that line. Once the two rivets point at Polaris your latitude is set. You could also just rotate the bridge perpendicular to the outer ring and sight along the length of the bridge. This might be easier for some. Use this procedure on the center of southern cross if you are in the southern hemisphere.
Adding 24 to 45 does not give you 59?
@@alanbanh Good point.
It is a small sundial. The margin for error can be large. The best you should expect is plus or minus about 15 minutes of the actual time. That has been my average result. I guess the results in my original comment were unusually accurate.
A larger sundial can be much more precise, but is a pain to carry around.
Thanks I ordered one and got it about a week ago this definitely helps understand the operations.
Nicely explained. You could also point out that this sundial can also be used as a compass, since the outer ring is in the north-south plane when the spot of light falls on the inner ring and tells the correct time. This loses accuracy near noon, and in fact near noon it can be hard to know if it is, say, half an hour to midday or half an hour after midday.
Also, you could note that sun time is up to 16 minutes fast or slow compared with a clock due to the earth's orbit, and your time zone may introduce another difference from clock time. So don't expect a sundial to tell the same 'time' as a clock. This type of dial indicates 12 o'clock when the sun is at its highest, half way between sunrise and sunset.
Great comment, thanks Chris! I really appreciate your detailed explainations. We intentionally tried to keep this video simple but might consider to do another "Pro version" deep diving into insights like the ones mentioned by you.
Thanks again!
I think the Equation of Time is small enough, compared with the resolution of a ring dial, that you could ignore it, but it dismays me that most people imagine that sundials are inherently inaccurate. So I like to let them know that, with a couple of simple refinements, sundials can tell time as well as many watches.
Chris Lusby Taylor time doesn't exist clocks do, the earth is flat and stationary a dial wouldn't work on a spinning ball neither could you time lapse the stars and North Star if 'we' was moving, research flat earth ;)
David Holdsworth Your an absolutely thick twit if you believe the earth is flat.
MilesDei I don't think I know, and as for thick twit, id kick your butt word and spar and win every time. Research flat earth, concentrate on water, it's called sea level for a reason, no where on earth does water conform to the exterior of shapes, no where, the is no curvature, no curve no ball, there's no experiment that's shows the earth is moving, none, ever!
Yo this is so dam cool😭ima get one
Thank you : )
Awesome
Where it is avoilable and what is the price
Can a larger model be made?
Understand the parts, understand how to set it up. It just doesn't project a "beam of light" on the hour ring for me....more like a shiny blur about 5mm wide. What's more, the shiny blur moves on the ring as I slowly rotate the sundial trying to get the beam to focus on a particular spot...the blur moves 2-3 hours in each direction but is never "a spot".
It's a curio, but not a useful one.
The ring is marked 1-12 in Roman numerals on each half, but which side is "morning" and which side is "afternoon" is a mystery.
The "beam of light" is an inaccurate description. It is a small, 2 millimeter, or 1/16 of an inch, circle of light. I had the same result as you (a blurry bar of light) for a few minutes, but after doing a little more research I found a video showing how to operate it, and it included a visual example of the dot of light. The video also explains which half is morning, and which half is afternoon. I think it will answer most of the questions you might have in how to operate the device. Aside from all of that, I agree with your conclusion with the device being an interesting, but non-essential curio. You need to be in direct sunlight to operate it, and you need to know your current locations geographic latitude. As a curio, it makes for a great static desk toy, because when you have it set up correctly, and it is hung someplace where it won't be disturbed, the device will tell you the following information (as written in the manual that came with it): "The outer ring is now positioned North/South. The inner ring is parallel to the equator, and the bridge is parallel to the Earth's axis. Thus, you not only have a sundial, but also a model of the Earth and a compass!"
For information on how to operate the device, check out this video: ruclips.net/video/MVIlcSbQCIc/видео.html&ab_channel=WatchGeek
It's not as difficult to make your own VERY accurate sundial as one might think. Go to Sundial Primer online.
Ditto- I have absolutely no way to determine which is "morning" and which is "afternoon", they appear exactly the same to me
@@darylnewhouse1796Look at the inner ring. There will be two faces. One face will have 1-12 going clockwise and the other will have it numbered anticlockwise. The side on the right is AM and the side on the left is PM. Think of the top as midnight and the bottom as noon. How do you tell where the top is? The top has the triangular piece.
Would the variable equation of solar time apply to this throughout a year?
No (this dial does not automatically account for the EOT). Neither would it account for mean solar time (your longitude within your time zone). At WORST however, it would never be off by more than 46 minutes.
What if it's a cloudy day, are you screwed?
Will not so k I. Sydney despite setting as described since the Roman numerals will need to be reversed! I know you won’t believe me but take this lovely little object when you cross the equator and you’ll see that I’m right! (Because your shadow now points south and not north but east and west don’t change). Look at the moon whilst your there and the other surprise is that it’s upside down - Honestly 😮)
That's nice and all, but for $41+ shipping is way too high. You can go to Harbor Freight and buy a brass sundial with compass for $8
But from Harbor Freight I would expect it to break or explode when you use it...
The HB version is a gimmicky piece of “made in China.” Kali sundials are expertly machined and fitted with precision. Nothing loose or flimsy. I was very impressed when mine arrived, but still working on my time-reading skills.
Ancient? 420 years old, about. Charming, but not necessarily as accurate or precise as one might wish.