A salsa container and a black plastic coffee can lid pair up well to form an improvised artificial horizon suitable for sextant celestial navigation practice when a sea horizon isn't available. Punch quarter inch holes around the perimeter of the coffee can lid to create a baffling effect that smooths and settles disturbances at the surface. Fill the salsa container to the rim with water then float in the plastic coffee can lid. Tap and spin the lid to remove any bubbles trapped under the lid.
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