How to make an Astrolabe: Part 1 - Stereographic Projections

Making of an Astrolabe is a series, having several videos with step-by-step methods to make an Astrolabe.
This video explains how the Celestial Sphere is Stereopgraphically projected onto the two-dimensional equatorial plain.

[@chesterbless9441]

I don't know how I fell down this rabbit hole, but I'm glad I've got a CZcams tutorial.

[@sumanprusty1173]

Thank you for this video. Ur a legend.

[@JacquelinHardy]

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

[@chiragdevani6164]

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.

[@steliostrigonis2343]

in 1:25 min i think the ecliptic should start from the one tropic and finich to the other (not the equator)...

[@chiragdevani6164]

Yes, i made a mistake while making this image. Thanks for pointing out.

[@chiragdevani6164]

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.