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David L wrote:

> And whomever created that web site is a nut case. I think most
> of us would be dead if the axis tilted that much.
>
> If the axial tilt had changed even one degree, my computerized
> telescope would be way off the mark when I direct to particular
> object in the sky. It's not off--not by a little bit.
>
> Unless you have a wide open view of the horizon, you don't see
> where the sun rises. And make sure you are not using a compass
> to find north. It's way off.
>
> The USNO site is where you go to get the straight scoop:
> [www.usno.navy.mil]



That's true. The writer of that article really doesn’t understand the phenomena he’s talking about. He’s confusing the overhead position of the sun at midday at the summer solstice with the sunrise and sunset points on the horizon.

Because of the earth’s tilt of 23.5 degrees the apparent movement of the sun in the Northern Hemisphere is a giant arc in the sky, tilted towards the south (with the remainder of the circle below the horizon from your point of view).



On the Tropic of Cancer, the sun will be overhead at midday on the summer solstice, but that doesn’t mean that the rising and setting points of the sun on the horizon on that day can’t be further north than that. They are, as is obvious from the diagram.

In fact, the further north you go on that day, the rising and setting points move further north too. In Britain, and other countries at that latitude, the rising and setting points are very far north, giving the extremely long days and short nights of summer. Move further north to just below the Arctic Circle, and the sun skirts the horizon in the north, rising and setting in effect due north. Further north again, to the North Pole itself, and the sun doesn’t set at all during midsummer. At ‘midnight’, it’s due north.

This page gives a clear explanation, with diagrams:

[physics.weber.edu]

Carol



Post Edited (04-Nov-12 16:25)

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Subject Views Written By Posted
Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 633 MrCymatics 03-Nov-12 18:38
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 169 carolb 03-Nov-12 19:07
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 215 MrCymatics 04-Nov-12 20:42
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 181 carolb 04-Nov-12 21:12
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 145 MrCymatics 04-Nov-12 21:32
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 149 carolb 04-Nov-12 22:54
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 245 Scott Creighton 05-Nov-12 10:34
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 153 carolb 05-Nov-12 13:24
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 199 Scott Creighton 05-Nov-12 13:39
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 143 carolb 05-Nov-12 16:34
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 180 Scott Creighton 05-Nov-12 17:27
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 198 MrCymatics 06-Nov-12 03:24
Re: Is it just me or did the Sun rise North of the Tropic of Cancer this Summer 207 Scott Creighton 06-Nov-12 12:01
49.5 axial tilt? Really? 215 David L 03-Nov-12 23:47
Re: 49.5 axial tilt? Really? 153 Warwick 03-Nov-12 23:56
Re: 49.5 axial tilt? Really? 144 MrCymatics 04-Nov-12 21:11
Re: 49.5 axial tilt? Really? 201 JonnyMcA 04-Nov-12 08:57
Re: 49.5 axial tilt? Really? 167 MrCymatics 04-Nov-12 21:18
Re: 49.5 axial tilt? Really? 182 carolb 04-Nov-12 21:30
Re: 49.5 axial tilt? Really? 209 MrCymatics 05-Nov-12 00:23
Re: 49.5 axial tilt? Really? 185 carolb 05-Nov-12 01:15
Re: 49.5 axial tilt? Really? 224 MrCymatics 06-Nov-12 03:20
Re: 49.5 axial tilt? Really? 208 carolb 06-Nov-12 13:52
Re: 49.5 axial tilt? Really? 204 MrCymatics 07-Nov-12 01:02
Re: 49.5 axial tilt? Really? 1246 carolb 04-Nov-12 13:43
Re: 49.5 axial tilt? Really? 196 MrCymatics 04-Nov-12 20:56


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