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Message: <blockquote data-quote="henry link" data-source="post: 3437682" data-attributes="member: 6806">Lee,DO NOT USE A REFLECTION OF THE SUN FROM A FLAT GLASS PANE!! Sorry for yelling, but that would send a full sized dangerously bright reflection of the sun into your eye that would be plenty bright enough to destroy your eyesight!. A small spherical or convexly curved object MUST be used, so that the reflection of the sun seen through the scope appears as a tiny star like point. The smaller the object (ball bearing, glass bead, Christmas tree ornament, light bulb, etc) the closer it can be placed to the telescope and still form a point source. I sometimes use a small silvered glass ornamental ball about 20mm in diameter at about 50m for star-testing small telescopes and binoculars.  A good place would be near the building with the sun behind you. Place the object in the open air with no hot surfaces like pavement between you and it. It's best if it's at least a few few feet above the grass, perhaps on top of a tripod or dangling from the tripod handle. Thanks for volunteering and please be careful.Henry</blockquote>