John, If you are not to concerned with getting the hourline traced across dips and hills on the ground, use a long straightedge (yardstick, meterstick, 8' - 16' extruded strip of aluminum flashing, etc.) to mark the line. You can maintain it on the shadow edge until the top of the hour and then mark the line.
Larry Bohlayer All MAIL: Celestial Products, Inc. P.O. Box 801 Middleburg, VA 20118-0801 All shipping: Celestial Products, Inc. 20659 St. Louis Rd. Philomont, Virginia 20131 U.S.A. USA (Eastern Time Zone or -5 UT) EMAIL: [EMAIL PROTECTED] VOICE: 540-338-4040 FAX: 540-338-4042 Order Line: 800-235-3783 On-line Catalog: http://www.celestialproducts.com
