Apparatus and method for indicating direction
Apparatus for viewing a representation of the celestial vault
Astrolabe having rotating rete and plate
Astronomical, particularly solar and/or lunar, goniometric...
Automatic sextant
Columnar sundial
Compass
Compass including means for displaying constellation data
Cylindrical sundial with installation indicia
Device for determining true bearing during daytime
Device for locating celestial bodies
Device to locate communication satellites
Direction indicator
Diurnal solar event triggering mechanism
Electronic sextant
Equatorial sundial
Equatorial sundial apparatus utilizing one or more concave...
Equatorial sundial with simple time and date interpretation
Geographical sundial
Heliostat-adjusting solar sight