a simple experiment that disproves flat earth

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a simple experiment that disproves flat earth
« on: March 28, 2019, 09:27:56 AM »
Put a long nail in a board slightly, sticking up so it casts a shadow. get it as straight as possible. Then place the board on the ground and level it. Mark the shadow every hour for a whole day. The next day, mount the board on an equatorial mount telescope so that the shadow aligns with one of the marks. Align the equatorial mount and then spin the assembly. The shadow will track correctly and the marks will be 15 degrees apart. This is something anyone can do on a low budget, and it is inconsistent with any flat earth models or theories. You can build your own equatorial mount with some boards and a segment of pipe.

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Bullwinkle

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Re: a simple experiment that disproves flat earth
« Reply #1 on: March 28, 2019, 10:36:59 AM »
You can build your own equatorial mount with some boards and a segment of pipe.

I would love to see what you built.
RE can never win this argument.
FE can't be disproved.

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wise

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Re: a simple experiment that disproves flat earth
« Reply #2 on: March 28, 2019, 11:41:56 AM »
Put a long nail in a board slightly, sticking up so it casts a shadow. get it as straight as possible. Then place the board on the ground and level it. Mark the shadow every hour for a whole day. The next day, mount the board on an equatorial mount telescope so that the shadow aligns with one of the marks. Align the equatorial mount and then spin the assembly. The shadow will track correctly and the marks will be 15 degrees apart. This is something anyone can do on a low budget, and it is inconsistent with any flat earth models or theories. You can build your own equatorial mount with some boards and a segment of pipe.

I'll be glad to see your result video.
ANNIHILATOR OF JACK'INOZ

ANNIHILATOR OF JOHN TURD DAVIS



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Danang

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rabinoz

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Re: a simple experiment that disproves flat earth
« Reply #4 on: March 29, 2019, 05:00:17 AM »
Put a long nail in a board slightly, sticking up so it casts a shadow. get it as straight as possible. Then place the board on the ground and level it. Mark the shadow every hour for a whole day. The next day, mount the board on an equatorial mount telescope so that the shadow aligns with one of the marks. Align the equatorial mount and then spin the assembly. The shadow will track correctly and the marks will be 15 degrees apart. This is something anyone can do on a low budget, and it is inconsistent with any flat earth models or theories. You can build your own equatorial mount with some boards and a segment of pipe.
It is a good test, but to the best of my knowledge, "the shadow will track correctly and the marks will be 15 degrees apart" only when the nail (the gnomon of a sundial) is mounted parallel to the earth's axis of rotation as in:
Quote
SUNDIALS AUSTRALIA, EQUATORIAL SUNDIALS


Using an Equatorial sundial at different locations (φ is the latitude angle)

The dial plate of an Equatorial sundial is either a flat plate or a circular ring whose plane lies perpendicular to the gnomon. The gnomon is usually a rod (sometimes in the form of a stylised arrow) passing through the centre of the dial plate and pointing towards the Celestial Poles, ie it is set at the latitude angle. Since the gnomon is parallel to the axis of rotation of the Earth, the dial plate of an equatorial sundial is therefore parallel to the plane of the equator (hence the name Equatorial sundial).

The Armillary Sphere sundial is a particularly attractive form of Equatorial sundial.


The Earth rotates on its axis through 360 degrees once every 24 hours, which means that in a single hour the Earth rotates through 15 degrees. Each 15 degrees subtended on the equatorial scale therefore represents 1 hourís rotation of the Earth on its axis. Since the hour divisions of an Equatorial sundial are equally spaced around the dialface regardless of the latitude of its location, the sundial can be adjusted to suit a range of different latitudes simply by altering the angle of the dialplate with respect to the horizontal plane so that the gnomon points towards the celestial poles (i.e. by tilting the gnomon to the correct latitude angle.)
That site, SUNDIALS AUSTRALIA, Artistic Timekeeping, is an "interesting read".

Re: a simple experiment that disproves flat earth
« Reply #5 on: April 04, 2019, 10:39:44 AM »
In spite of some low-content replies, you can see my results. Proof of concept only, as it's very roughly done.





Re: a simple experiment that disproves flat earth
« Reply #6 on: April 15, 2019, 10:37:36 PM »
You said you wanted a video, but you have no rebuttal?

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Heavenly Breeze

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Re: a simple experiment that disproves flat earth
« Reply #7 on: April 16, 2019, 09:15:55 AM »
Tell me, then why every day at exactly noon the shadow of the "gnome" points exactly to the pole? After all, at different times of the year, the earth turns in different directions, and such a thing in a princep on a ball with an axis should not be.

Are you sure that the earth is not such?

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wise

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Re: a simple experiment that disproves flat earth
« Reply #8 on: April 16, 2019, 10:14:25 AM »
In spite of some low-content replies, you can see my results. Proof of concept only, as it's very roughly done.





It proves the earth is flat. Thanks.
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Heavenly Breeze

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Re: a simple experiment that disproves flat earth
« Reply #9 on: April 16, 2019, 10:33:49 AM »
Quote
It proves the earth is flat. Thanks.

It is said very correctly

Are you sure that the earth is not such?

Re: a simple experiment that disproves flat earth
« Reply #10 on: April 16, 2019, 11:46:18 AM »
Breeze (troll?), you are incorrect. The shadow direction is absolutely consistent with the mainstream globe model. Can you provide more details what you mean exactly? draw a sketch or something to illustrate what you mean?

Wise (troll), also incorrect.

Re: a simple experiment that disproves flat earth
« Reply #11 on: April 16, 2019, 02:02:47 PM »
Tell me, then why every day at exactly noon the shadow of the "gnome" points exactly to the pole? After all, at different times of the year, the earth turns in different directions, and such a thing in a princep on a ball with an axis should not be.
It doesn't.
At different times of the year, at noon, it will point roughly due north for anyone north of the Tropic of Cancer.
Note, this is not exactly due north, it will vary to some extent. It is only at solar noon (which can be offset from actual noon by a small variation over the year, as well as time zones not being perfectly aligned) that it will be due north.
In other locations (like where I live, south of the Tropic of Capricorn) it will be to the south instead.
Then there are locations between the tropics where for some parts of the year it will be north and for others it will be south.

This is what you would expect for a round Earth.