Video

I have to check. I haven't used it ever.

Will do it

@@chiragdevani6164 Thanks

Please feel free to ask, if any clarification required.

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.

Welcome 👍

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.

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

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.

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

Stellarium

@@chiragdevani6164 Desktop version?

@@chiragdevani6164 can you show how can we use unequal hour lines plz+?

@@aybekoloji yes, stellarium desktop version

I am curious about Astronomy, and specially positional astronomy. So, always was in search or astronomical instruments, and found out Astrolabe.

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.

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

I am always fascinated with mathematics and practical astronomy rather than observational astronomy. I was intrigued with astrolabe and the mathematics behind its making.

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.

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

Still 6 parts are left. Due to busy schedule unable to make. Will soon post the remaining parts as and when time permits

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.

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.

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.

I used photoshop.

There are around 15 parts. On 5th, 8th, 11th the next parts are going to be released

@@chiragdevani6164 i will watch every episode 👍

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

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.

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।

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