Heliochron

A heliochron comprising:

• a box-like housing having a bottom wall, a front wall, a rear wall, and laterally spaced side walls, an open top chamber formed in said housing;
• a cover having a top wall and a bottom wall;
• hinge means securing said cover to said box-like housing;
• an elongated latitude scale member having a top edge and a front surface, said top edge being secured to the bottom surface of said cover, a latitude scale imprinted on said front surface, a longitudinally extending slot in said latitude scale member;
• an elongated latitude adjustment arm having a front end and a rear end, an index member mounted in said latitude adjustment arm adjacent its front end and extending laterally thereto and received in the slot in said latitude scale member;
• means for pivotally securing the rear end of said latitude adjustment arm to the interior of said box-like housing;
• an hour scale recess formed in the top wall of said cover, said recess having a vertical semi-circular wall and a horizontal planar surface, an hour scale imprinted on said semi-circular wall to denote hours for the northern hemisphere, an hour scale imprinted on said horizontal planar surface to denote hours for the southern hemisphere;
• an elongated gnomon having a top end and a bottom end;
• and
• means for detachably mounting the bottom end of said gnomon at a predetermined point in the horizontal planar surface of said hour scale recess so said gnomon will be at 90 degrees to said planar surface.