Meade 12 inch Instruction Manual - Page 28
Finding True North
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E E 16° West Declination N W W S Orienting Arrow Point of knob and "North" line up Magnetic Pointing Arrow - 28 2. Rotate the knob/compass so that the magnetic pointing arrow lies directly over the painted black alignment arrow (painted on the bottom surface of the compass, Fig. 18). The "North" position on the direction scale (and the point on the knob/compass) now point directly north. Centerline of wedge Magnetic North E True North W W S E N E Fig. 16: Magnetic Compass. c. Finding True North The Magnetic Compass is now ready to use. Just follow these simple steps for a quick and easy azimuth alignment: 1. Loosen the knob/compass slightly. This allows for rotation of the equatorial wedge under the knob/compass (Fig. 17). The magnetic pointing arrow will point to magnetic north. Centerline of wedge Magnetic North N W W E S Fig. 18: Equatorial Wedge. 3. Rotate the equatorial wedge in azimuth (without moving the knob/compass) until the centerline of the wedge lines up with the point of the knob/compass (Fig. 19). The centerline of the equatorial wedge now falls directly on the true north line. Magnetic North Fig. 17: Equatorial Wedge. W S E N E W True North and centerline of wedge Fig. 19: Equatorial Wedge. 4. Tighten the knob/compass, locking the equatorial wedge into place. The field tripod and equatorial wedge are now pointed directly toward celestial north, without ever having seen the North Star.