Artificial horizon

This "artificial horizon" can be used in cunjunction with a sextant to practise celestial navigation at home. Just print the parts and get hold of a pair of plain window glasses with a thickness of 2 mm and 125 mm * 125 mm length and width (I paid 4 € for both of them at the local glazier).

Stick the two sides (they are identical) in the respective holes in the bottom part and fill the bottom with 1 to 2 cm of some fluid. A viscous fluid (motor oil, molasses) might work better, but even water will do if it is not windy. Then insert the two glasses into the guides on the two sides. These windows will stop the wind from messing up the fluid. You can improve wind protection by applying some adhesive tape to cover the remaining gaps.

Before you start working with your sextant please ensure that you have the appropriate filters in place, especially if you want to measure the sun. You MUST also take care that there is a filter towards the horizon as you will be looking at the reflectio