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Human Sundial

This document provides step-by-step instructions for creating a human sundial, including how to find north, draw the necessary lines, and mark hour angles specific to Gandhinagar in February. It includes a list of angles for each hour and links to timelapse videos demonstrating the sundial's functionality. Additionally, it offers resources for creating sundials in other locations and encourages sharing results via email or social media.

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Anusha Sinai KUNDE
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58 views3 pages

Human Sundial

This document provides step-by-step instructions for creating a human sundial, including how to find north, draw the necessary lines, and mark hour angles specific to Gandhinagar in February. It includes a list of angles for each hour and links to timelapse videos demonstrating the sundial's functionality. Additionally, it offers resources for creating sundials in other locations and encourages sharing results via email or social media.

Uploaded by

Anusha Sinai KUNDE
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Human Sundial

Step1: Find north using a compass and draw a line pointing towards north. This is
the North-south line.

Step 2: Draw another line perpendicular to it, cutting this line from the middle. This is
the East-west

Step 3: The intersection of these two lines is the origin. Draw 2 points, 180 cm from
the origin on the East-west line.

Step 4: Put two small sticks and the foci of this ellipse (at 180 cm away from origin)

and using a rope of 4 meter draw the ellipse. You should have something like this.

Step 5: Now, you have to mark the hour lines. We are providing you the angle from
the North-south line for each hour. For example, 2 pm is at 38 degrees and 9 am is
at 77 degrees. Moreover, you have to place your feet 50 cm below the origin and see
where your shadow points.

For each hour the angle is: Here is the list:

●​ 7 PM = 91 degrees
●​ 6 PM = 85 degrees
●​ 5 PM = 78 degrees
●​ 4 PM = 70 degrees
●​ 3 PM = 148 degrees
●​ 2 PM = 128 degrees
●​ 1 PM = 94 degrees
●​ 12 PM = 31 degrees
●​ 11 AM = 54 degrees
●​ 10 AM = 68 degrees
●​ 9 AM = 77 degrees
●​ 8 AM = 84 degrees
●​ 7 AM = 90 degrees

This sundial is for gandhinagar and feb month.


We shot a timelapse video making this sundial with chalk.
https://drive.google.com/file/d/178bZHWEZCH3q0eLsvnA46IQNnjqv2x1X/view

If you want to make a sundial for any other location you can use this website. You
will have to add the correction because of the equation of time as well which is
provided here. https://analemmatic.sourceforge.net/cgi-bin/sundial.pl

As we don’t have daylight savings, we have to select the option of No daylight


savings at my location. You can find more instructions as well on the website.

Here is a time lapse video showing how the shadow moves across the day in 2
hours.
https://drive.google.com/file/d/1iiNCOyHcdWaV__bcDqk6LBWHlrIXIsJp/view?usp=dr
ive_link

Conclusion:

Make this human sundial for your location and share the pics with us at
eklavya@iitgn.ac.in or s.rashmi@iitgn.ac. If you are on instagram then tag us at
@ccl_iitgn or @astro_roxy

References:

https://www.instructables.com/Large-driveway-sidewalk-or-garden-sundial/

https://plus.maths.org/content/analemmatic-sundials-how-build-one-and-why-they-w
ork

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