# Sundials on a FE

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##### Sundials on a FE
« on: July 06, 2016, 07:14:51 AM »
Exactly how do sundials work on a FE?

Specifically, on the equinox on the equator, a vertical sundial produces a shadow that (1) travels due W/E and (2) therefore, it travels in a straight line and (3) only the length of the shadow changes. The video below shows how it works on a RE. Starting @1:30:

If the Sun is 1/4 of the Earth away NE at sunrise (NW at sunset), how on a FE can it produce straight shadow lines?

On the equinox using the map below (it doesn't have to have equidistant latitudes):
1) IF the Sun is where the yellow vertical line (longitude) meets the red circle just below Africa (noon)
2) 6 hrs earlier it was where the horizontal line (longitude) meets the red line on the right
3) 6 hrs later it will be where the horizontal line (longitude) meets the red line on the left
4) How does that produce a shadow that is a straight line E/W that only varies in length?

« Last Edit: July 06, 2016, 07:17:05 AM by Jadyyn »
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#### rabinoz

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##### Re: Sundials on a FE
« Reply #1 on: July 06, 2016, 05:36:27 PM »
Exactly how do sundials work on a FE?

Specifically, on the equinox on the equator, a vertical sundial produces a shadow that (1) travels due W/E and (2) therefore, it travels in a straight line and (3) only the length of the shadow changes. The video below shows how it works on a RE. Starting @1:30:

If the Sun is 1/4 of the Earth away NE at sunrise (NW at sunset), how on a FE can it produce straight shadow lines?

On the equinox using the map below (it doesn't have to have equidistant latitudes):
1) IF the Sun is where the yellow vertical line (longitude) meets the red circle just below Africa (noon)
2) 6 hrs earlier it was where the horizontal line (longitude) meets the red line on the right
3) 6 hrs later it will be where the horizontal line (longitude) meets the red line on the left
4) How does that produce a shadow that is a straight line E/W that only varies in length?

I would say that sundials prove at least a Globe Earth with an extremely distant sun.