true north question
Posted 30 March 2009 - 09:36 PM
Posted 30 March 2009 - 10:12 PM
Yes, it depends on your location. Here's a website that will look up your latitude and longitude based on your zipcode and then look up the magnetic declination. If, for example, your declination is 5 degrees west, your compass needle points 5 degrees west of true north.
Posted 30 March 2009 - 10:13 PM
Posted 30 March 2009 - 10:45 PM
Enter in your latitude/longitude and the date. It will tell you when solar noon is. Have a nice stick in the ground, ready for it. Mark it at the appropriate time. Done.
Posted 30 March 2009 - 11:22 PM
Posted 31 March 2009 - 06:41 AM
I'm beginning to think that every astronomers garden needs an accurate N/S line set up permanently :-)
Posted 31 March 2009 - 07:39 AM
First you need to clarify if you want to find the magnetic north or the earth rotation north. They are very different in some parts of the globe.