The stick at high noon is a very good method and a lot more useful
than stars at night. You do not have to live exactly at the time
zone meridian. You just have to find the sunrise and sunset for
*your* location and date. So here are the steps:
1. Find the sunrise and sunset time for the location and day you are
going to do the experiment. You can find that in your local
newspaper or visit
http://aa.usno.navy.mil/data/docs/RS_OneYear.html and type in the
state and city. (For even greater accuracy and greater generality,
you can enter the exact latitude and longitude instead of using the
city/state combination) The web site has the times in ST without the
daylight correction.
For example it lists the sunrise and sunset times are 0530 and 1852
EST for Rochester, NY on August 28, 2006. With the daylight
correction the times are 0630 and 1952 EDT.
2. Compute the mid point which is high noon for the day and location
specified. The duration of the day is 19:52 - 06:30 = 13 h 22 min.
Half of that is 6h 41 min. Adding that to 6h 30 min (sun rise time),
I get 1:11PM EDT.
3. The shadow of a vertical stick (use a plumb line for greater
accuracy) at 1:11PM on August 28, 2006 at Rochester, NY points due
North.
Regards,
Raj, N2RD
> Here we go again.
> This method only works for those who live exactly on the time zone
> meridian.
> Don
> N8DE
>
> J A Ritter wrote:
> Two sticks, one vertical, the other horizontal placed along the
> path of
> the
> shadow at high noon will show True North...
>
> 73,
> Jack W0UCE
> Website: www.w0uce.net
>
> ailman/listinfo/towertalk
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