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Chirag Devani
India
Registrace 18. 11. 2017
How to make an Astrolabe: Part 15b - Projecting Calendar Scale, Part 2
This video shows the method of projecting calendar scale.
In this part of the video, out of the three, one point for projecting the calendar is shown.
Thank you to all who have watched these videos.
In this part of the video, out of the three, one point for projecting the calendar is shown.
Thank you to all who have watched these videos.
zhlédnutí: 130
Video
How to make an Astrolabe: Part 15a - Projecting Calendar Scale, Part 1
zhlédnutí 139Před 2 měsíci
This video shows the method of projecting calendar scale. In this part of the video, out of the three, one point for projecting the calendar is shown.
How to make an Astrolabe: Part 14 - Calendar Scale
zhlédnutí 193Před 2 měsíci
This video shows the method for dividing a circle into 365.25 degrees for a calendar scale. Making an Astrolabe is a series of several videos with step-by-step methods to create an Astrolabe.
How to make an Astrolabe: Part 13 - Shadow Square and Cotangent Scale
zhlédnutí 511Před rokem
This video shows the method for making shadow square and cotangent scale. Shadow Square is used to find out the distance or height of an object if one of them is known. Making an Astrolabe is a series, with several videos having step-by-step methods to create an Astrolabe. Image credit: Stoffler, Elucidatio Fabricae ususque astrolabii 1553
How to make an Astrolabe: Part 12 - Backside Unequal Hours
zhlédnutí 616Před rokem
This video shows how to make unequal hours on the backside of the Astrolabe. Making an Astrolabe is a series of several videos with step-by-step methods to make an Astrolabe.
How to Make an Astrolabe: Part 11- Making Rule
zhlédnutí 433Před rokem
This video shows the method for making rule. Making an Astrolabe is a series, with several videos having step-by-step methods to create an Astrolabe. While using the formula of Climate circles, calculate declination for 1 degree.
How to make an Astrolabe: Part 10 - Projecting Stars and DSOs
zhlédnutí 733Před 2 lety
This video shows the simple method of projecting Stars and DSOs. If, anyone is using the formula of climate circles to find the declination of stars or DSOs, then for negative declination use the formula of the Tropic of cancer with the negative sign or use the formula of the Tropic of Capricorn without the negative sign of declination. Making an Astrolabe is a series, with several videos havin...
How to make an Astrolabe: Part 9 - Projecting Ecliptic Circle
zhlédnutí 717Před 2 lety
This video shows the simplest way of projecting the Ecliptic circle. This video also shows the formula for projecting the Ecliptic. Making an Astrolabe is a series, with several videos having step-by-step methods to make an Astrolabe.
How to make an Astrolabe: Part 8b - Projecting Unequal Hours
zhlédnutí 781Před 2 lety
This video shows how to make unequal hours on the front side of the Astrolabe. Making an Astrolabe is a series of several videos with step-by-step methods to make an Astrolabe.
How to make an Astrolabe: Part 8a - Projecting Unequal Hours
zhlédnutí 1,3KPřed 2 lety
This video shows how to make unequal hours on the front side of the Astrolabe. Making an Astrolabe is a series of several videos with step-by-step methods to make an Astrolabe.
How to make an Astrolabe: Part 7 - Projecting Azimuths
zhlédnutí 766Před 2 lety
This video shows the simplest way of projecting the Azimuth circles for observers at different latitudes and shows the formula for projecting the Azimuth circles. Making an Astrolabe is a series of several videos with step-by-step methods to make an Astrolabe.
How to make an Astrolabe: Part 6 - Projecting Prime Vertical
zhlédnutí 800Před 2 lety
This video shows the simplest way of projecting the Prime Vertical for observers at different latitudes. This video also shows the formula for projecting the Prime Vertical. Making an Astrolabe is a series, with several videos having step-by-step methods to make an Astrolabe.
How to make an Astrolabe: Part 5 - Projecting Twilight
zhlédnutí 706Před 2 lety
This video shows the simplest way of projecting the Twilight for observers at different latitudes. This video also shows the formula for projecting the Twilight. Making of an Astrolabe is a series, having several videos with step-by-step methods to make an Astrolabe.
How to make an Astrolabe: Part 4 - Projecting Altitudes
zhlédnutí 1KPřed 2 lety
This video shows the simplest way of projecting the Altitudes for observers located at different latitudes. This video also shows the formula for projecting the altitudes. Making of an Astrolabe is a series, having several videos with step-by-step methods to make an Astrolabe.
How to make an Astrolabe: Part 3 - Projecting Horizon
zhlédnutí 1,2KPřed 2 lety
This video shows the simplest way of projecting the Horizon for observers at different latitudes. This video also shows the formula for projecting the Horizon. Making of an Astrolabe is a series, having several videos with step-by-step methods to make an Astrolabe.
How to make an Astrolabe: Part 2 - Making Climate Circles
zhlédnutí 1,8KPřed 2 lety
How to make an Astrolabe: Part 2 - Making Climate Circles
How to make an Astrolabe: Part 1 - Stereographic Projections
zhlédnutí 3,1KPřed 2 lety
How to make an Astrolabe: Part 1 - Stereographic Projections
Astrolabe: Find the Earth - Sun distance
zhlédnutí 192Před 4 lety
Astrolabe: Find the Earth - Sun distance
Astrolabe: Find Sunrise and Sunset with the help of Astrolabe
zhlédnutí 458Před 4 lety
Astrolabe: Find Sunrise and Sunset with the help of Astrolabe
Astrolabe: Find the Right Ascension of the Sun with the help of Astrolabe.
zhlédnutí 173Před 4 lety
Astrolabe: Find the Right Ascension of the Sun with the help of Astrolabe.
Astrolabe: Find DECLINATION of Sun with the help of Astrolabe
zhlédnutí 209Před 4 lety
Astrolabe: Find DECLINATION of Sun with the help of Astrolabe
Astrolabe: Find Longitude of Sun with the help of Astrolabe
zhlédnutí 542Před 4 lety
Astrolabe: Find Longitude of Sun with the help of Astrolabe
Sundials: Babylonian and Italic Sundial
zhlédnutí 134Před 4 lety
Sundials: Babylonian and Italic Sundial
❤ Very good. Could you make the same project in geogebra. That would be interesting to watch.
I have to check. I haven't used it ever.
I truely appreciate your videos. Can you make a video about usage of umbra recta and umbra versa
Will do it
@@chiragdevani6164 Thanks
very good explanation
wonderful serious, thanks a lot. even though the last part was the toughest to understand. i will watch it again.
Please feel free to ask, if any clarification required.
I really appreciate videos like this, where the important thing is how to make the astrolabe manually!! Thanks 👍
Post more videos on astrolabe. And also videos abot other devices like it.😊
There are many videos about how to use astrolabe posted. I only know 30-40 odd usage. But majority of them are posted here
@@chiragdevani6164 i like your videos.keep making videos i will watch every video.
Thank you very much, your work is very valuable to me !! 👍
At the end of the video, i showed that the last part is of 1.23 degree, which shows 1.25 of February. Every year 0.25 is added so the leap year gets automatically adjusted.
Normally i use Photoshop
how would you represent the 29 of February on the calendar scale?
brilliant
Make all parts video very soon. And which software you use?
Please continue this Series
thanks 👍
Welcome 👍
17 degree of Aquarius not clear ,,
soria WHAT MEAN PLEASE? there is no google translator
Are you sure about the formulas to draw the prime vertical ? I tried it many times and the circle is too big. Thank you for your videos
Yes, the formulas are absolutely right. And you are also right the circle is too big. You just need to make an arc instead of drawing entire circle and its center will be way out of the image or paper you are drawing. You need to be slightly creative.
To draw the twilights, you can use the same formula (the one used for the altitudes), and use -6, -12 and -18 for altitude. It works fine
Thk you.
Thank you very much brother. Your tutorial both about math and production of astrolabe was amazingly helpful. I couldnt find any source until you
You speak quickly and your explanation is not understood
I am sorry for that. I am not into making videos, and don't have skills in doing so. I understand that my videos are not very good, but this was the best I could manage. I tried to share what I know.
@@chiragdevani6164 On the contrary, your videos are good and useful. Continue. Just reduce the speed of your speaking with explanations. I do not mean to criticize. I just wanted to tell you that, and thank you for your effort
in 1:25 min i think the ecliptic should start from the one tropic and finich to the other (not the equator)...
Yes, i made a mistake while making this image. Thanks for pointing out.
While showing the projection from three dimensional to 2 dimensional on to the equatorial plane I showed the proper diagram, but it seems while making the last figure i was careless to verify before posting it.
Hi, thank you so much for your hard work. I have been looking for these tutorial for a long time. I would love to build one in brass, do you have anybwebsite to recommend to print it so to transfer on the plates? Thank you for your help Chirag. Cheers, Paolo.
Yes there are many websites, by entering latitude and longitude u will get the print. But I don't remember them, but by googling u will find it
@@chiragdevani6164 thank you my friend from some where in the world. I will keep you posted on my advancement, if any... It will be a long journey. Success or not you will be the 1st to be credited. Without your knowledge and willing to share it I would have never been so thrilled to start all over again. I hope to see some new video and tutorial of yours soon. Ciao Paolo
What is the software you show with world model?
Stellarium
@@chiragdevani6164 Desktop version?
@@chiragdevani6164 can you show how can we use unequal hour lines plz+?
@@aybekoloji yes, stellarium desktop version
Thank you!
I would love to now where you found your astrolabe.
I am curious about Astronomy, and specially positional astronomy. So, always was in search or astronomical instruments, and found out Astrolabe.
We need tutorial about using shadow Square
Sure.
A tutorial would be great. Thanks for all your effort with this.
I couldn't find any tutorial about using shadow square. I can't appreciate you enough for what you are doing. Thank you for everything.
👍👍👍👍
Thanks
Thanks
Please continue this Series
Sure. I was also thinking of completing as it is long due. Soon will late you know. Approximately six parts will be there.
@@chiragdevani6164 thank you very much
How did you learn all this?
I am always fascinated with mathematics and practical astronomy rather than observational astronomy. I was intrigued with astrolabe and the mathematics behind its making.
I don't know how I fell down this rabbit hole, but I'm glad I've got a CZcams tutorial.
I think stereographic projection does not work that way. In particular, your idea of deploying dual-point projections from S' and S is not stereographically correct.
In the first part of how to make astrolabe. I have shown how stereographic projection works. In the first part of this video, I have shown the simplest form of projecting climate circles. As climate circles are projected on to two-dimensional plane. The sizes of the circles will be different. Still if you fill that how it is not done. Then, in the next part of this video I have given the mathematical formula for calculating the size of the climate circles, means the tropics and the equator. And you may compare the sizes of the circles made by simple form and done by using mathematical formula. There will be no difference. Still if you feel this is not stereographic projection, you may help to understand how stereographic projection are made. I will readily accept it. But, I am using my hand made Astrolabe since 15th November 2016, since almost 6 years. And I am getting readings with only 1-2 minutes error.
Sorry, I find myself lost following your hand written inscription of 'equator'. Isn't that supposed to be the meridian?
The meridian line is the North South line. When you project three dimensional meridian circle it will be a straight line joining North South poles in two dimensions. 1. In the previous video on climate circles, you will see there are three concentric circles, two tropics and one equatorial circle. And showed how to draw them. 2. Now, when we talk about latitude of a person, it is measured from the equator to the North Pole (I.e from 0 to 90). For people leaving to the North of equator. 3. So, I didn't show the two circles of the tropics and pointed out only the equatorial circle as it was not required here, other wise the whole diagram would have been messy. Omission of tropical circles might have lead to your confusion. I hope this will answer your query, still I will help you if still there is any query
@@chiragdevani6164 Thank you for your reply. I will go and see the earlier video to this. Am I right to say that since the circle you drew expresses a sphere you are actually adopting two views at the same time - looking from on top of North celestial pole for constructing your horizon and looking from side (the equator) when explaining the stereographic projection. Correct?
I took a look into your earlier presentation. I think you have to rethink about your idea of what stereographic projection is all about.
@@josephlai9759 No, for the people on the northern hemisphere, the circles are projected as viewed from the south and vice a versa for the people living in south of equatorial plane There is no two view, the entire astrolabe is projected as viewed from the south for the people in the northern hemisphere. you may also find several videos on youtube itself showing how stereographic projection of astrolabe works, if i am unable to explain in this video
Very interesting! Really good quality video and incredibly fascinating!
Thank you for making these very educational and interesting videos! Appreciate your work.
Thanks for continuing your work on the astrolabe, it is very interesting and useful.
Still 6 parts are left. Due to busy schedule unable to make. Will soon post the remaining parts as and when time permits
Sir we made astrolobe for our project but one thing we didn't understand that is the relation between zodiac constellation and outer most degree scale for example why Libra is on 0 degree on back please answer if you know...
The outermost degree scale is to find the altitude of the Sun. As such there is no correlation between this degree scale and the zodiac scale. The zodiac scale and degree scale both are of 360 degrees. If both are drawn separately, it will take more space. So please view them separately rather than one.
we made astrolobe for our project but one thing we didn't understand that is the relation between zodiac constellation and outer most degree scale for example why Libra is on 0 degree please answer if you know...
Libra is not at zero degrees on zodiacal constellations We start marking constellation from First point of Aries, the point when the SUN crosses from south to the north of equator which is also the point of Vernal equinox. The zodiacal constellations are divided into twelve equal parts of 30 degrees each from this point. Hence the exact opposite of first point of Aries is the first point of Libra the seventh constellation. So the first point of Libra is at 180 degrees. So if you are marking the outer degree scale into 360 degrees than you will find Libra at 180 degrees, but if you are marking degree scale in two or four parts from 0-180 or 0-90 degrees than obviously you will find Libra at 0 degrres.
आपनेतीनो सर्कल के निर्माण की विधि वहुत ही सुन्दर प्रकार से समझाई... धन्यवाद! क्या आप हिन्दी मे नही समझा सकते? हमारे राष्ट्र मे हिन्दी भाषी भी है जो इस जानकारी को पाना चाहते हैं पर विदेशी भाषा नही जानते.. इस कारण वह नही जान पाते! आप अंग्रेजी के साथ हिन्दी भी वोला करें... तो परमोत्तम रहेगा! इसके कारण एक वहुत वडा वर्ग आपसे जुड जायेगा!
Thank you for making this video! Could you make a video on how to divide the ecliptic ring? I don’t know why each zodiac sign on the ecliptic ring has different size, for example, Cancer and Capricorn.
Please watch the complete video. You will get ur answer when the video reaches around 3:06
Also please watch video on climate circles. Part 2 of this series
@@chiragdevani6164 thank you
I was also looking for dividing the ecliptic in 12 parts. As per Chirag, I looked at 3:06 but could not find the steps for the same.
Which software u use to construct this?
I used photoshop.
I always wanted to know how to draw one by hand. Thank you.
There are around 15 parts. On 5th, 8th, 11th the next parts are going to be released
@@chiragdevani6164 i will watch every episode 👍
Thank you for this video. Ur a legend.
What is the calculation between gnomon and date line?
Where can I find this astrolabe to buy?
Well, i really don't know, you may search online. I made it myself. I am thinking of making videos of how to make it at home, as many are asking of it.
@@chiragdevani6164 Please go ahead
Excellent work. Could you please help me to draw the month line or zodiac line with latitude?
Sure. I will send you how to calculate
I have to make many videos relating to calculations.
@@chiragdevani6164 Yes that will be very helpful.
@@chiragdevani6164 Still waiting for your calculations
@@sksakirali7784 give me some time. It can be done when I am free.
आप हिन्दी मे समझाने की व्हीडियो भी वनाये..
जरूर से प्रयास करुंगा।
आपका बाट्स एप नम्वर क्या है?
नमस्कार, आप से एक विनती है। आप जब वीडियो देखते है तब वहां सेटिंग्स में subtitles/cc को चालू कीजिए । जब आप चालू करेंगे तो उसमे आप को auto-translate दिखाई देगा। auto-translate पर क्लिक करने से आप हिंदी भाषा पसंद किज्ये जिससे सारे वीडियो का अनुवाद आपको हिंदी में वीडियो के साथ दिखाई देगा। धन्यवाद।
Hello Chirag, this is really good video. In your sundial, you need corrections. This i can understand. Now there are many videos about the vertical sundial in Konark temple. If you see them, the guides just tell the time on fly. I fail to understand how it is constructed. I will be happy if you throw some light. Thanks
The error that arises is bcs the wall is not exactly south facing and it has some declination of approximately 3-5 degrees. The mathematics behind it is very simple and requires basic trigonometry knowledge, as you can see i am very poor in making videos and i cancelled making video of how to calculate and make your own sundial
I have made many markings of time on a small sundial hence it is looking meshy. Bigger the sundial, more precision can be achieved. And in none of my sundial which i made on my terrace i tried to level the plane hence bit of error was expected. I just wanted children to realise that they can have their own jantar mantar on their terrace
@@chiragdevani6164 Thanks for the reply. If you see this video, czcams.com/video/UiDuMX1euYc/video.html, the gnomon ( i.e a stick in this case, inserted by the guide ) is perpendicular to the vertical sundial. Usually it should be at an angle equal to latitude. Any idea how a perpendicular gnomon works? Thanks once again
@@pacchutubu1. As you may see that the guide didn't place the stick at the center of gnomon (i.e. at the center of the wheel, but was placed at the edge of the diameter of thick gnomon, as a result there is displacement of shadow. Even the stick is not touching the face of gnomon it is place at an angle towards West. Hence the equation of time around August is approximately -6 mins was avoided due to this angle. 2. Perpendicular gnomons to the face of sundial can be seen either in equatorial or polar sundial. 3. As here the gnomon is perpendicular but the stick was at the edge of the diameter of thick gnomon, I have to calculate how much thickness is required to counter the approximately 19.0 degree latitude of konark sun temple. Our ancestors were always genius, and as result I like calculating and making such things like sundials and astrolabe. 4. Thank you for bringing this to my knowledge, I will calculate how it works. But one thing for sure one has to always consider EOT in there reading of time.
@@chiragdevani6164 Ok. So now the whole equation changes, thanks a lot for you too. BR