I think Don may have meant that the method only works "on the time zone meridian" if you take your shadow reading at High Noon as shown on your local clock. If the crossed-sticks method described doe
Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>
Date: Sun, 27 Aug 2006 15:27:24 -0400
Theoretically 15 degrees wide. I think you will be able to find some times zones that are over 20 degrees at their widest points. The Eastern time zone in the US is a good example. It runs from *abo
Author: "Richard M. Gillingham" <rmoodyg@bellsouth.net>
Date: Mon, 28 Aug 2006 09:54:46 -0400
Plus, down here (Miami) the city lights make it tough to see most of the time. If Ursa Minor was as easy to see as Orion, that would be different. 73 Gil, W1RG -- Original Message -- From: "Keith Dut
One should also be warned that sometimes a magnetic compass is useless also due to declination anomalies. If one doesn't know about them, they can really screw one up! See inserted info below. Sighti
I use my GPS receiver. Walk from the tower base to what you believe is close to true north, then check your return path - it should be 180 degrees. If not, then repeat the process until you find it.
Thanks. I think I will stay with my current method of employing a deviation-compensated magnetic compass while up on the tower. 73, Keith NM5G --Original Message-- From: towertalk-bounces@contesting.
There are some subtleties with GPS.. particularly if there's things around that can cause multipath. The typical probable error circle is going to be in the few meters range, so, to get 1 degree accu
ORIGINAL MESSAGE: -- REPLY FOLLOWS -- Do you compensate the compass while at the top of the tower? If the tower is steel, the top may have a different magnetic field from the bottom. -- Bill, W6WRT _
Yep ./././ -- For the graphics to this method, take a peek at a vintage Boy Scouts of America handbook .. worky worky! 73 Mark AA6DX -- Original Message -- From: "Rajiv Dewan, N2RD" <n2rd@arrl.net> T
According to "true north", is the North Star really at 0.00 degrees from north? Is it our actual "true north"? 73, Jim _______________________________________________ ________________________________
No. The north star makes a little circle about 1.5 degrees in diameter around the true north point. (RA 02 31 49.08, Decl +89 15 50.8 in J2000 coordinates) so it's about 3/4 degree off celestial nort
And even more: http://www.cadastral.com/cad-polr.htm THE ADVANTAGES OF POLARIS OBSERVATIONS IN LAND SURVEYING _______________________________________________ _________________________________________
ORIGINAL MESSAGE: -- REPLY FOLLOWS -- According to Wikipedia, Polaris is 42 minutes of arc away from true north, so as the earth rotates, it describes a circle around true north of that radius. For h
Author: Robert Chudek - KØRC <k0rc@citlink.net>
Date: Sun, 17 Sep 2006 20:22:45 -0500
Well, yes it is... using the stick and shadow method the first thing you need is a LEVEL surface to track the tip of the shadow... So this begs the question that I hear on the contesting reflector al
Here is a golden opportunity for a talented computer programmer! If Polaris makes the rotation as described then it passes right through true north twice per rotation. The needed software will tell u
Easier than you think.. That's what the RA (right ascension) is used for. You have to take into account the date and longitude to get your local sidereal time (LST). When RA=LST, polaris is directly
You've already paid for it... http://aa.usno.navy.mil/data/docs/topocentric.html Select PositionType: Apparent Topocentric Zenith Distance and Azimuth Celestial Body of Interest: Polaris Fill in the
Jim This is still measuring it with a micrometer, marking it with a piece of chalk and cutting it with an ax. 73 Bill W7VP You've already paid for it... http://aa.usno.navy.mil/data/docs/topocentric.